Bump xunit from 2.4.2 to 2.9.1

[dependabot[bot]]

Bumps xunit from 2.4.2 to 2.9.1.

Commits

• bb7c3e4 v2.9.1
• 5d70d25 #3028: Support IGrouping<TKey,TValue> in Assert.Equivalent (v2)
• ed6e05b Add support for IGrouping<,> in ArgumentFormatter, assuming it's safe to re-e...
• d97c7f8 Restore TestInvoker<T>.GetTaskFromResult (forwards to AsyncUtility.TryConvert...
• 416ed81 #3021: Add overload of Assert.Equal to resolve compiler ambiguity
• 6b86235 Add Assert.Equivalent support for evaluating Lazy<T>
• aadff05 Updated build table in README
• 1949c78 Missing <properties> wrapper in JUnit output
• 7dceffa #2979: Update JUnitXml.xslt, based on https://github.com/testmoapp/junitxml?t...
• 935af73 Latest assertion tests
• Additional commits viewable in compare view

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