Merge pull request #38894 from dotnet/dependabot/nuget/samples/snippets/core/testing/unit-testing-best-practices/csharp/before/xunit-2.6.4

Bump xunit from 2.6.3 to 2.6.4 in /samples/snippets/core/testing/unit-testing-best-practices/csharp/before

Author: github-actions[bot]

samples/snippets/core/testing/unit-testing-best-practices/csharp/before/unit-testing-best-practices-before.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit" Version="2.6.3" />
+    <PackageReference Include="xunit" Version="2.6.4" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" />
   </ItemGroup>