Bump xunit from 2.5.3 to 2.6.0

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.3 to 2.6.0.
- [Commits](xunit/xunit@2.5.3...2.6.0)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Tests/Tests.csproj

@@ -9,6 +9,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
-    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit" Version="2.6.0" />
   </ItemGroup>
 </Project>