chore(deps): update xunit-dotnet monorepo to 2.9.1

Author: renovate[bot]

Diff for: src/Directory.build.props

@@ -50,8 +50,8 @@
 
   <ItemGroup Condition="$(IsTestProject)">
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-    <PackageReference Include="xunit" Version="2.9.0" />
-    <PackageReference Include="xunit.runner.console" Version="2.9.0" />
+    <PackageReference Include="xunit" Version="2.9.1" />
+    <PackageReference Include="xunit.runner.console" Version="2.9.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageReference Include="Xunit.StaFact" Version="1.1.11" />
     <PackageReference Include="FluentAssertions" Version="6.12.0" />