Bump xunit from 2.6.2 to 2.6.5

[dependabot[bot]]

Bumps xunit from 2.6.2 to 2.6.5.

Commits

• 7f82765 v2.6.5
• 98f19dd Updated tests (for analyzer exclusions)
• 298b1b1 #2854: Add constructors and AddRange for TheoryData<T>
• 36fe729 Bump up to v2.6.5-pre
• 0f87ff7 v2.6.4
• e466a7c Unit tests for #2850 (v2)
• 0cc026b Add KeyValuePair tests with collections and IEquatable objects in the key slot
• c729d7f Add collection dictionary tests for IEquatable<> objects in the value slot
• 0eb76d2 Attempt to fix race condition reported in visualstudio.xunit/issues#396
• 348c56d Bump up to v2.6.4-pre
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #164.