chore(deps): update xunit-dotnet monorepo (#96)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/directory.packages.props

@@ -36,8 +36,8 @@
 
   <ItemGroup>
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.analyzers" Version="1.20.0" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.2" />
+    <PackageVersion Include="xunit.analyzers" Version="1.21.0" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
   </ItemGroup>
   <Import