Bump xunit.runner.visualstudio to 3.1.0, 3.1.1 (#396)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: roslyn
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: roslyn
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]