Bump MaterialDesignThemes from 5.3.0 to 5.3.1 (#122)

---
updated-dependencies:
- dependency-name: MaterialDesignThemes
  dependency-version: 5.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -25,7 +25,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageVersion>
     <PackageVersion Include="gong-wpf-dragdrop" Version="4.0.0" />
-    <PackageVersion Include="MaterialDesignThemes" Version="5.3.0" />
+    <PackageVersion Include="MaterialDesignThemes" Version="5.3.1" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.3" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="10.0.3" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />