Bump xunit.runner.visualstudio from 2.8.2 to 4.0.0

[dependabot]

Updated xunit.runner.visualstudio from 2.8.2 to 4.0.0.

Release notes

Sourced from xunit.runner.visualstudio's releases.

4.0.0

Release notes: https://xunit.net/releases/visualstudio/4.0.0

4.0.0-pre.5

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.5

4.0.0-pre.4

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.4

4.0.0-pre.3

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.3

3.1.5

Release notes: https://xunit.net/releases/visualstudio/3.1.5

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[turinglambdaai]

Closing: these test-stack majors (Microsoft.NET.Test.Sdk 18 / xunit.runner.visualstudio 4 / coverlet 10) are interlocking and should land as one deliberate set, not piecemeal — a half-migrated combination is worse than staying on the current pinned versions.

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