Update xunit-dotnet monorepo

Author: renovate[bot]

UnitTest/UnitTest.csproj

@@ -9,8 +9,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
+    <PackageReference Include="xunit" Version="2.6.4" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <ItemGroup>