Bump xunit.runner.visualstudio from 2.5.0 to 2.5.1 (#239)

Author: dependabot[bot]

test/Directory.Build.targets

@@ -3,7 +3,7 @@
     <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="17.6.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
     <PackageReference Include="xunit" Version="2.5.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>