Bump the xunit group with 2 updates (#677)

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 2.8.0 to 2.8.1
- [Commits](xunit/xunit@2.8.0...2.8.1)

Updates `xunit.runner.visualstudio` from 2.8.0 to 2.8.1
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.8.0...2.8.1)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
  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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Directory.Packages.props

@@ -17,9 +17,9 @@
     <PackageVersion Include="NSubstitute" Version="5.1.0" />
     <PackageVersion Include="ReportGenerator" Version="5.3.0" />
     <PackageVersion Include="Shouldly" Version="4.2.1" />
-    <PackageVersion Include="xunit" Version="2.8.0" />
+    <PackageVersion Include="xunit" Version="2.8.1" />
     <PackageVersion Include="xRetry" Version="1.9.0" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.0" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.1" />
     <PackageVersion Include="Xunit.SkippableFact" Version="1.4.13" />
   </ItemGroup>
   <ItemGroup Condition=" '$(IsTestProject)' == 'true' ">