Bump xunit from 2.8.1 to 2.9.0

[dependabot[bot]]

Bumps xunit from 2.8.1 to 2.9.0.

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[coveralls]

coverage: 99.158% (-0.05%) from 99.209% when pulling e4a52c58041efe69cf67722023ab7cac4150b318 on dependabot/nuget/xunit-2.9.0 into f682e88cb185d247ae1afb50d7eb2318260ec232 on main.

[bitfaster]

@dependabot rebase