nuget: bump the xunit group across 1 directory with 3 updates

[dependabot[bot]]

Bumps the xunit group with 3 updates in the /DotMP-Tests directory: xunit, xunit.runner.console and xunit.runner.visualstudio.

Updates xunit from 2.7.1 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

Updates xunit.runner.console from 2.7.1 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

Updates xunit.runner.visualstudio from 2.5.7 to 2.8.2

Commits

• 699d445 v2.8.2
• e5e6fba Move 2.x builds to the v2 branch
• a501f16 Updated .gitignore
• 07a1bdd Add launchSettings.json to .gitignore
• 3762114 Update README build table to Markdown
• 78342f0 Latest builder
• 970f773 Updated .gitignore
• b343d87 Bump up to v2.8.2-pre
• ce9211e v2.8.1
• 3656cb8 Use 'dotnet format' instead of 'dotnet dotnet-format'
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like these dependencies are updatable in another way, so this is no longer needed.