Bump xunit from 2.4.0 to 2.6.6

[dependabot[bot]]

Bumps xunit from 2.4.0 to 2.6.6.

Commits

• f03fe09 v2.6.6
• 280a0cb Update build to use .NET SDK 8 and C# 12 (#2863)
• fdf75ab #2334: Add assembly-level support for BeforeAfterTestAttribute (v2)
• ba06476 Add targetFramework for xunit.assert.nuspec
• 9db7d30 Test out additional target framework dependencies in .nuspec files
• 27e91e3 Bump up to 2.6.6-pre
• 7f82765 v2.6.5
• 98f19dd Updated tests (for analyzer exclusions)
• 298b1b1 #2854: Add constructors and AddRange for TheoryData<T>
• 36fe729 Bump up to v2.6.5-pre
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (80faa87) 68.32% compared to head (715bdad) 68.15%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #181 +/- ## ========================================== - Coverage 68.32% 68.15% -0.18% ========================================== Files 11 11 Lines 584 584 Branches 109 109 ========================================== - Hits 399 398 -1 Misses 129 129 - Partials 56 57 +1 ```

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[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.