[release/6.0-rc1] Update dependencies from dotnet/icu#57763

Merged

ViktorHofer merged 1 commit intorelease/6.0-rc1from

darc-release/6.0-rc1-192e4d55-a756-4888-9db9-eaa99f115fb8

Aug 20, 2021

Commits on Aug 19, 2021

Update dependencies from https://github.com/dotnet/icu build 20210819.1
dotnet-maestro[bot]
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