chore(deps): update xunit to v2.8.1

Author: renovate[bot]

Directory.Packages.props

@@ -37,8 +37,8 @@
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.8" />
-    <PackageVersion Include="xunit" Version="2.7.1" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.1" />
+    <PackageVersion Include="xunit" Version="2.8.1" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
     <PackageVersion Include="Verify.Xunit" Version="22.11.5" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.2.0" />