Bump xunit.runner.visualstudio from 2.5.7 to 2.8.1

[dependabot]

Bumps xunit.runner.visualstudio from 2.5.7 to 2.8.1.

Commits

• ce9211e v2.8.1
• 3656cb8 Use 'dotnet format' instead of 'dotnet dotnet-format'
• 45eb783 Pull in output printing bug fix from core
• e205244 #408: Add ability to print live output messages
• 06087e3 Latest actions versions
• 075f3ff Bump up to 2.8.1-pre
• 6438bb8 v2.8.0
• 2afd4cd Pick up latest dependencies
• b8be108 Add multiplier format support to RunSettings
• 3c2e493 Update to 2.7.2-pre.17 and support Xunit.ParallelAlgorithm in RunSetttings
• Additional commits viewable in compare view

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