Bump xunit.core from 2.5.3 to 2.6.0

[dependabot[bot]]

Bumps xunit.core from 2.5.3 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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Dependabot will merge this PR once CI passes on it, as requested by @JoshKeegan.

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[JoshKeegan]

@dependabot merge

[dependabot[bot]]

One of your CI runs failed on this pull request, so Dependabot won't merge it.

Dependabot will still automatically merge this pull request if you amend it and your tests pass.

[JoshKeegan]

@dependabot rebase