build(deps): bump MahApps.Metro from 2.4.3 to 2.4.4 in /samples (#229)

Bumps [MahApps.Metro](https://github.com/MahApps/MahApps.Metro) from 2.4.3 to 2.4.4.
- [Release notes](https://github.com/MahApps/MahApps.Metro/releases)
- [Changelog](https://github.com/MahApps/MahApps.Metro/blob/develop/GitReleaseManager.yaml)
- [Commits](MahApps/MahApps.Metro@2.4.3...2.4.4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

samples/LoginApp.Wpf/LoginApp.Wpf.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MahApps.Metro" Version="2.4.3" />
+    <PackageReference Include="MahApps.Metro" Version="2.4.4" />
     <PackageReference Include="ReactiveUI.WPF" Version="13.*" />
   </ItemGroup>