Bump Microsoft.DotNet.XHarness.TestRunners.Xunit

Bumps [Microsoft.DotNet.XHarness.TestRunners.Xunit](https://github.com/dotnet/xharness) from 10.0.0-prerelease.24564.1 to 10.0.0-prerelease.24568.1.
- [Commits](https://github.com/dotnet/xharness/commits)

---
updated-dependencies:
- dependency-name: Microsoft.DotNet.XHarness.TestRunners.Xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="xunit" Version="2.9.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
-    <PackageVersion Include="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="10.0.0-prerelease.24564.1" />
+    <PackageVersion Include="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="10.0.0-prerelease.24568.1" />
     <PackageVersion Include="xunit.assert" Version="2.9.2" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Debug" Version="9.0.0" />
     <PackageVersion Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />