Bump xunit from 2.5.0 to 2.6.0

[dependabot[bot]]

Bumps xunit from 2.5.0 to 2.6.0.

Commits

• 6a07b95 v2.6.0
• 5a7297e #2806: Performance improvements in Assert.Equal (v2)
• a6b5cc4 Add net6.0 binary to xunit.assert
• abc1dd3 Update Microsoft.NETCore.App.Ref to 6.0
• 52b6638 Move CA1304 and CA1305 enablement to production code only (not test code)
• e139d77 Ensure all throws of NotImplementedException contain messages
• 8a84fdb Ensure all GetHashCode functions are implemented (#2804) (v2)
• c853205 Unit tests for #2803 (v2)
• 8ffe56a Unit tests for #2800 (v2)
• b2e660e Replace (most) concatenation and interpolation (in shipped code) with String....
• Additional commits viewable in compare view

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