chore(deps): update dependency system.collections.immutable to 9.0.8

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
System.Collections.Immutable (source)	nuget	patch	9.0.7 -> 9.0.8

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Release Notes

dotnet/runtime (System.Collections.Immutable)

v9.0.8: .NET 9.0.8

Release

What's Changed

• [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1165144
• [release/9.0] Disable all MT tests on CI by @​ilonatommy in https://github.com/dotnet/runtime/pull/116747
• [9.0] Revert squash commit and pulls release/9.0 again by @​jozkee in https://github.com/dotnet/runtime/pull/116764
• [release/9.0-staging] Backport "Dispose Xunit ToolCommand" by @​ilonatommy in https://github.com/dotnet/runtime/pull/116685
• [release/9.0-staging] Skip SSL key log test for OpenSSL 3.5+ by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1166877
• [release/9.0-staging] Fix absolute path check when loading hostfxr/hostpolicy/coreclr by @​elinor-fung in https://github.com/dotnet/runtime/pull/116775
• Update openssl dependency for SLES by @​NikolaMilosavljevic in https://github.com/dotnet/runtime/pull/116922
• [9.0] Backport 115546 FLS initialization fix to 9. by @​mangod9 in https://github.com/dotnet/runtime/pull/116872
• [release/9.0-staging] Update dependencies from dotnet/roslyn by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1171377
• [release/9.0-staging] Update dependencies from dotnet/icu by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1166811
• [release/9.0-staging] Update dependencies from dotnet/cecil by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1164555
• [release/9.0-staging] Update dependencies from dotnet/arcade by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1169488
• [release/9.0-staging] Update dependencies from dotnet/hotreload-utils by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1155966
• [release/9.0-staging] Update dependencies from dotnet/source-build-reference-packages by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1155888
• [release/9.0-staging] Map version for Tahoe compatibility. by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1166411
• [9.0] Update CI OSes by @​richlander in https://github.com/dotnet/runtime/pull/115503
• Update branding to 9.0.8 by @​vseanreesermsft in https://github.com/dotnet/runtime/pull/117283
• [release/9.0-staging] Update dependencies from dotnet/sdk by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1166833
• Disable odbc tests on net9 interpreter by @​BrzVlad in https://github.com/dotnet/runtime/pull/117245
• [release/9.0-staging] Update dependencies from dotnet/cecil by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1172288
• [release/9.0-staging] Update dependencies from dotnet/icu by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1172577
• [release/9.0-staging] Update dependencies from dotnet/hotreload-utils by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1171844
• [release/9.0-staging] Update dependencies from dotnet/runtime-assets by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1166644
• [release/9.0-staging] Update dependencies from dotnet/xharness by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1169088
• [release/9.0] Update dependencies from dotnet/emsdk by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1166266
• [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1172966
• [release/9.0-staging][wbt] Prevent InvalidOperationException on TestOutputHelper logging. by @​ilonatommy in https://github.com/dotnet/runtime/pull/116916
• [release/9.0-staging] Harden Ping_TimedOut_* tests by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1166300
• Merging internal commits for release/9.0 by @​vseanreesermsft in https://github.com/dotnet/runtime/pull/117442
• [release/9.0-staging] Fix ILogB for subnormal values by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1169733
• [release/9.0-staging] Fix ordering issue in interface trimming by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1145099
• [release/9.0-staging][mono][gc] Fix gc descriptor computation for InlineArray structs by @​BrzVlad in https://github.com/dotnet/runtime/pull/116951
• [release/9.0-staging] Fix few RandomAccess.Write edge case bugs by @​adamsitnik in https://github.com/dotnet/runtime/pull/109646
• [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @​github-actions[bot] inhttps://github.com/dotnet/runtime/pull/1174711
• [release/9.0-staging] Update dependencies from dotnet/xharness by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1175944
• [release/9.0-staging] Update dependencies from dotnet/sdk by @​dotnet-maestro[bot] inhttps://github.com/dotnet/runtime/pull/1175955
• [manual] Merge release/9.0-staging into release/9.0 by @​tarekgh in https://github.com/dotnet/runtime/pull/117634

Full Changelog: dotnet/runtime@v9.0.7...v9.0.8

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR has been generated by Renovate Bot.

[claude]

Claude finished @thomhurst's task —— View job

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PR Review: System.Collections.Immutable Update

Review Summary ✅

This is a clean, low-risk dependency update from Renovate bot that looks good to merge.

Code Quality & Best Practices ✅

• Centralized dependency management: Using Directory.Packages.props correctly
• Semantic versioning: Following patch version update (9.0.7 → 9.0.8)
• Automated dependency management: Renovate bot properly configured with automerge

Security & Compatibility Analysis ✅

• No breaking changes: .NET 9.0.8 is a patch release containing only bug fixes
• Security improvements: Includes various stability and security fixes from Microsoft
• Version consistency: Other .NET 9.0.x packages in the project are already at 9.0.8 (Microsoft.Bcl.AsyncInterfaces, Microsoft.EntityFrameworkCore, etc.)

Performance Considerations ✅

Based on the .NET 9.0.8 release notes:

• Bug fixes only: No performance regressions expected
• Stability improvements: Includes fixes for edge cases and memory management
• Immutable collections: No API changes that would affect performance characteristics

Notable Fixes in 9.0.8

• Fix for ILogB subnormal values
• Interface trimming ordering fixes
• GC descriptor computation fixes for InlineArray structs
• RandomAccess.Write edge case bug fixes
• Various stability improvements

Test Coverage 📋

• Cannot verify build locally (SDK version mismatch: need 9.0.304, have 8.0.118)
• CI pipeline will validate compatibility automatically
• No test changes needed for patch-level dependency updates

Recommendation: APPROVE ✅

This is a standard maintenance update with:

• ✅ No breaking changes
• ✅ Bug fixes and stability improvements
• ✅ Follows project's dependency management patterns
• ✅ Automated testing will catch any integration issues

The automerge configuration is appropriate for this type of patch update.

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Todo List

• Read repository setup instructions (CLAUDE.md) - No repo-specific setup found
• Review the changed file (Directory.Packages.props) - Line 77: System.Collections.Immutable updated to 9.0.8
• Analyze .NET 9.0.8 release notes for breaking changes - Reviewed release notes
• Run build/tests to verify compatibility - Cannot run due to .NET SDK version mismatch (need 9.0.304, have 8.0.118)
• Provide comprehensive review feedback - Completed above

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