Bump xunit from 2.6.3 to 2.6.4

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.3 to 2.6.4.
- [Commits](xunit/xunit@2.6.3...2.6.4)

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

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

WebDriverManager.Tests/WebDriverManager.Tests.csproj

@@ -11,7 +11,7 @@
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" />
         <PackageReference Include="Selenium.WebDriver" Version="4.16.2" />
-        <PackageReference Include="xunit" Version="2.6.3" />
+        <PackageReference Include="xunit" Version="2.6.4" />
     </ItemGroup>
 
     <ItemGroup>