Bump the xunit group with 1 update (App-vNext#1902)

Bumps the xunit group with 1 update: [xunit](https://github.com/xunit/xunit).


Updates `xunit` from 2.6.5 to 2.6.6
- [Commits](xunit/xunit@2.6.5...2.6.6)

---
updated-dependencies:
- dependency-name: xunit
  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

@@ -40,7 +40,7 @@
     <PackageVersion Include="System.Threading.RateLimiting" Version="$(MicrosoftExtensionsVersion)" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
     <PackageVersion Include="System.ValueTuple" Version="4.5.0" />
-    <PackageVersion Include="xunit" Version="2.6.5" />
+    <PackageVersion Include="xunit" Version="2.6.6" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 </Project>