Update xunit-dotnet monorepo to v2.5.1

Author: renovate[bot]

Tests/Directory.Build.props

@@ -10,8 +10,8 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.1" />
     <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="17.6.1" />
     <PackageReference Include="Moq" Version="4.18.4" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" PrivateAssets="All" Version="2.4.5">
+    <PackageReference Include="xunit" Version="2.5.1" />
+    <PackageReference Include="xunit.runner.visualstudio" PrivateAssets="All" Version="2.5.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
   </ItemGroup>