build(deps): bump MaterialDesignThemes from 5.2.0 to 5.2.1 (#25)

Bumps [MaterialDesignThemes](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit) from 5.2.0 to 5.2.1.
- [Release notes](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/releases)
- [Commits](MaterialDesignInXAML/MaterialDesignInXamlToolkit@v5.2.0...v5.2.1)

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

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

Directory.Packages.props

@@ -24,7 +24,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageVersion>
-    <PackageVersion Include="MaterialDesignThemes" Version="5.2.0" />
+    <PackageVersion Include="MaterialDesignThemes" Version="5.2.1" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="9.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />