[release/6.0-rc1] Update dependencies from dotnet/icu

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/dotnet/icu

• Subscription: 1a1cda8f-d18a-4416-3a40-08d961c5a689
• Build: 20210819.1
• Date Produced: 8/19/2021 6:52 PM
• Commit: d5bcc9e6ee6b9a196996c28f283414674617d10e
• Branch: refs/heads/release/6.0-rc1

• Updates:
  • Microsoft.NETCore.Runtime.ICU.Transport: from 6.0.0-rc.1.21416.1 to 6.0.0-rc.1.21419.1

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[lewing]

arcade flow

[lewing]

runtime (Libraries Test Run checked coreclr Linux arm Release)

https://helixre8s23ayyeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-pull-57763-merge-f9442c68757543d495/System.Runtime.Tests/1/console.81cb9a1a.log?sv=2019-07-07&se=2021-09-08T23%3A47%3A52Z&sr=c&sp=rl&sig=O8X65xyK97R0N0ZIYbdqG%2Fw638FV2%2F7WZ3Ivju0NF5E%3D

Stack overflow.

Assert failure(PID 58 [0x0000003a], Thread: 76 [0x004c]): Consistency check failed: FAILED: m_crawl.pFrame->IsTransitionToNativeFrame()
    File: /__w/1/s/src/coreclr/vm/stackwalk.cpp Line: 2269
    Image: /root/helix/work/correlation/dotnet

./RunTests.sh: line 162:    58 Aborted                 (core dumped) "$RUNTIME_PATH/dotnet" exec --runtimeconfig System.Runtime.Tests.runtimeconfig.json --depsfile System.Runtime.Tests.deps.json xunit.console.dll System.Runtime.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing $RSP_FILE
/root/helix/work/workitem

cc @tarekgh

[ViktorHofer]

Filed #57807