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[main] Source code updates from dotnet/dotnet (#65006)
Treat all ProjectRefs to SharedFx projects as PrivateAssets=all (#64863)
Rename Microsoft.Aspnetcore.Testing to Microsoft.AspNetCore.InternalTesting (#51713)
chore : Remove unwanted `using` statement (#39176)
Reorganize the src/WebSockets/ folder to follow new source code organization conventions
[master] Update dependencies from 3 repositories (#12977)