Update dependency xunit.runner.visualstudio to v4

[renovate]

This PR contains the following updates:

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

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Release Notes

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

v4.0.0

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Pull request overview

Updates centrally managed xUnit testing dependencies to version 4.0.0.

Changes:

• Upgrades xunit.runner.visualstudio from 3.1.5 to 4.0.0.
• Upgrades xunit.v3.mtp-v2 from 3.2.2 to 4.0.0.

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Suppressed comments (1)

Directory.Packages.props:46

• xunit.runner.visualstudio 4.x is the xUnit v3 adapter, but the test projects still reference the xUnit v2 stack (xunit, xunit.extensibility.execution, and xunit.runner.console at 2.9.3; see test/Microsoft.VisualStudio.Composition.Tests/Microsoft.VisualStudio.Composition.Tests.csproj:13-17 and test/VS.Mefx.Tests/VS.Mefx.Tests.csproj:12-16). Upgrading only this central version will leave the VS adapter incompatible with the tests, so discovery/execution will fail. Keep the v2-compatible adapter here, or migrate all xUnit packages and test projects together to v3.

    <PackageVersion Include="xunit.runner.visualstudio" Version="4.0.0" />

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