Bump xunit from 2.4.2 to 2.5.1 in /tests/SourceGeneratorUtils.Tests

[dependabot[bot]]

Bumps xunit from 2.4.2 to 2.5.1.

Commits

• 9dc851b v2.5.1
• 86b0eef #2770: Make SerializationHelper public
• f49dafc File re-sort for SerializationHelper & XunitSerializationInfo
• d0004ae #2773: Add Assert.RaisesAny and Assert.RaisesAnyAsync non-generic for EventAr...
• c1dba28 Latest assertions
• b7c828e Move .editorconfig up into contentFiles
• 08e74e7 Add .editorconfig to assert source NuGet package to indicate generated code (...
• 79f411a #2767: Verify types match when comparing FileSystemInfo values (v2)
• 9c28f58 Latest dependencies
• 63dce4f #2767: Special case FileSystemInfo objects by just comparing the FullName in ...
• Additional commits viewable in compare view

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