Fix SentryAssetBundle on Flutter > 3.1

[ueman]

📜 Description

Fix #875

💡 Motivation and Context

Fix #875

💚 How did you test it?

New test

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov-commenter]

Codecov Report

Merging #877 (7c33cae) into main (b1f0ff6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #877   +/-   ##
=======================================
  Coverage   89.76%   89.76%           
=======================================
  Files         102      102           
  Lines        3146     3146           
=======================================
  Hits         2824     2824           
  Misses        322      322           

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[brustolin]

LGTM