Update to Preview 6 .NET SDK

[ViktorHofer]

To double check:

• The right tests are in and and the right validation has happened. Guidance: https://github.com/dotnet/arcade/tree/main/Documentation/Validation

[ViktorHofer]

That's the version mentioned here: https://dotnet.microsoft.com/en-us/download/dotnet/8.0. Is that the correct one?

[mmitche]

I think that's correct. Unhelpfully, aspnet and runtime had the same version number in p5. Either way, it'll fail if it's wrong.

[ViktorHofer]

@agocke PTAL

src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs(332,5): error IL2091: 'T' generic argument does not satisfy 'DynamicallyAccessedMemberTypes.Interfaces' in 'Xunit.Assert.Equal(T, T, IEqualityComparer)'. The generic parameter 'T' of 'Xunit.Assert.StrictEqual(T, T)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.