chore(deps): update dependency xunit to v2.6.6

Author: renovate[bot]

Directory.Packages.props

@@ -38,7 +38,7 @@
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
-    <PackageVersion Include="xunit" Version="2.6.5" />
+    <PackageVersion Include="xunit" Version="2.6.6" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
     <PackageVersion Include="Verify.Xunit" Version="22.11.5" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.2.0" />