Bump xunit from 2.7.0 to 2.8.1 (#2212)

Bumps [xunit](https://github.com/xunit/xunit) from 2.7.0 to 2.8.1.
- [Commits](xunit/xunit@2.7.0...2.8.1)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Directory.Packages.props

@@ -44,6 +44,6 @@
     <PackageVersion Include="System.Net.Http.Json" Version="8.0.0" />
     <PackageVersion Include="Xunit.Extensions.Logging" Version="1.1.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.7" PrivateAssets="All" />
-    <PackageVersion Include="xunit" Version="2.7.0" />
+    <PackageVersion Include="xunit" Version="2.8.1" />
   </ItemGroup>
 </Project>