[release/5.0-rc2] Update ICU dependency

[EgorBo]

This PR brings fixes from dotnet/icu#38 for icudt*.dat files (resources).

Customer Impact

We tried to strip as much data as we can from icudt.dat for 5.0 release and got rid of some pieces that our customers might need.
Fortunately, these pieces don't increase size much: +~30kb uncompressed or +4kb after compression).

dotnet/icu#37 - Add all en-* locales (fixes #42328)
dotnet/icu#34 - Fix datetime formats for KN and several other locales (fixes dotnet/aspnetcore#25521 (comment))
dotnet/icu#25 - Add Japanese calendar for ja(ja_JP) locale (it used to accept only english letters for japanese era name, e.g. "Heisei" instead of "平成")

Testing

System.Globalization.* tests + local testing

Risk

Low, this PR only updates icudat.dat resource files

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