Bump xunit.runner.visualstudio (#46025)

Bumps the dotnet group in /docs/core/testing/snippets/order-unit-tests/csharp/XUnit.TestProject with 1 update: [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit.runner.visualstudio` from 3.0.2 to 3.1.0
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@3.0.2...3.1.0)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

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

Author: dependabot[bot]