Bump Xunit to V3 to resolve transitive ambiguity problems

[Ducki]

If the testing project is using Xunit 3, references to the Assert method and others fail because this library references Xunit 2. The compiler then has ambiguity problems that cannot seem to be resolved by using aliases.

It would be nice, if there was a version of this library, that uses Xunit 3 as well.

[lateapexearlyspeed]

Hi @Ducki thanks for issue.

I checked and seems because xunit v3 uses assertion pack whose name is new xunit.v3.assert. Based on its practice guidance, I also create new separate lib with new name as what xunit.net did, for xunit v3.

For your xunit v3 test project, please use LateApexEarlySpeed.Xunit.V3.Assertion.Json which references xunit.v3.assert, thanks.

(Will also update doc for supporting xunit v3 project)

[Ducki]

Thank you so much! <3