Bump xunit from 2.9.0 to 2.9.1 (#2556)

Bumps [xunit](https://github.com/xunit/xunit) from 2.9.0 to 2.9.1.
- [Commits](https://github.com/xunit/xunit/compare/2.9.0...2.9.1)

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

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

tests/PSRule.Tests/PSRule.Tests.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="Microsoft.PowerShell.SDK" Version="7.4.5" />
     <PackageReference Include="Moq" Version="4.20.72" />
-    <PackageReference Include="xunit" Version="2.9.0" />
+    <PackageReference Include="xunit" Version="2.9.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>