chore(deps): update xunit-dotnet monorepo

This MR contains the following updates:

Package	Type	Update	Change
xunit	nuget	minor	2.7.1 -> 2.9.0
xunit.extensibility.core	nuget	minor	2.7.1 -> 2.9.0
xunit.runner.visualstudio	nuget	minor	2.5.8 -> 2.8.2

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Release Notes

xunit/xunit (xunit)

v2.9.0

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v2.8.1

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v2.8.0

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xunit/visualstudio.xunit (xunit.runner.visualstudio)

v2.8.2

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v2.8.1

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v2.8.0

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