Update xunit-dotnet monorepo to v4

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This PR contains the following updates:

Package	Change	Age	Confidence
xunit.runner.visualstudio	3.1.5 → 4.0.0
xunit.v3	3.2.2 → 4.0.0

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Release Notes

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

v4.0.0

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