Update XUnit to v2.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
xunit	2.6.6 -> 2.8.0
xunit.assert	2.6.6 -> 2.8.0
xunit.runner.visualstudio	2.5.6 -> 2.8.0

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Release Notes

xunit/xunit (xunit)

v2.8.0

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v2.7.1

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v2.7.0

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

v2.8.0

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v2.5.8

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v2.5.7

Compare Source

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Configuration

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