Bump xunit from 2.4.0 to 2.6.3

[dependabot[bot]]

Bumps xunit from 2.4.0 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

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[dependabot[bot]]

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