Bump the tests group with 2 updates

[dependabot[bot]]

Bumps the tests group with 2 updates: xunit and xunit.runner.visualstudio.

Updates xunit from 2.5.0 to 2.6.3

Commits

• 4c2c193 v2.6.3
• c4e29fd xunit/xunit#2811: Add tests for SortedSet and ImmutableSortedSet overloads fo...
• 51851a6 Unit tests to ensure equality assertions with sets + comparer func throw an e...
• ca68393 Unit tests for #2828 (v2)
• 62505d1 Unit tests for #2824 (v2)
• b41e8ad Obsolete the delegating sinks in favor of a single ExecutionSink
• 512d24f Update README
• 5684d87 Bump up to v2.6.3-pre
• f69c77d v2.6.2
• 9ef018a Latest dependencies
• Additional commits viewable in compare view

Updates xunit.runner.visualstudio from 2.5.0 to 2.5.5

Commits

• 28b46ff v2.5.5
• 409be7a Add PackageId to solve VS issues (see dotnet/sdk#22...
• 56db5de Latest dependencies (and use ExecutionSink instead of delegating sinks)
• 1f419e6 Update README
• f052a1d Bump up to v2.5.5-pre
• b9eacec v2.5.4
• 316c225 Latest dependencies
• 9d3aaa0 Latest dependencies
• da1033b Latest dependencies
• 8b76089 Remove unnecessary global.json
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #28.