Bump the xunit group with 2 updates (#352)

Bumps the xunit group with 2 updates: [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit` from 2.6.6 to 2.7.0
- [Commits](xunit/xunit@2.6.6...2.7.0)

Updates `xunit.runner.visualstudio` from 2.5.6 to 2.5.7
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.6...2.5.7)

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

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

Directory.Packages.props

@@ -9,6 +9,6 @@
     <PackageVersion Include="PseudoLocalizer.Humanizer" Version="0.9.0" />
     <PackageVersion Include="Shouldly" Version="4.2.1" />
     <PackageVersion Include="xunit" Version="2.6.6" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.7" />
   </ItemGroup>
 </Project>