Bump the xunit group with 2 updates

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] <[email protected]>

test/Directory.Packages.props

@@ -7,8 +7,8 @@
     <PackageVersion Include="coverlet.collector"                                Version="6.0.0" />
     <PackageVersion Include="coverlet.msbuild"                                  Version="6.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk"                            Version="17.9.0" />
-    <PackageVersion Include="xunit"                                             Version="2.6.6" />
-    <PackageVersion Include="xunit.runner.visualstudio"                         Version="2.5.6" />
+    <PackageVersion Include="xunit"                                             Version="2.7.0" />
+    <PackageVersion Include="xunit.runner.visualstudio"                         Version="2.5.7" />
   </ItemGroup>
 
 </Project>