main
chore : Remove unwanted `using` statement (#39176)
Add rule to seal internal and private types (#41457)
Rename Microsoft.Aspnetcore.Testing to Microsoft.AspNetCore.InternalTesting (#51713)
Upgrade xunit version to 2.9.0 (#57303)
Treat all ProjectRefs to SharedFx projects as PrivateAssets=all (#64863)
Make Stream.Flush no-op on read-only streams (#57079)
Enable throw helper analyzers (#45954)
Use file scoped namespaces (#38076)