Bump MaterialDesignThemes and MaterialDesignThemes.MahApps in /src

Bumps [MaterialDesignThemes](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit) and [MaterialDesignThemes.MahApps](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit). These dependencies needed to be updated together.

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

Updates `MaterialDesignThemes.MahApps` 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
- dependency-name: MaterialDesignThemes.MahApps
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/SDAT/SDAT.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="MaterialDesignThemes" Version="5.2.1" />
-    <PackageReference Include="MaterialDesignThemes.MahApps" Version="5.2.0" />
+    <PackageReference Include="MaterialDesignThemes.MahApps" Version="5.2.1" />
     <PackageReference Include="Prism.Unity" Version="9.0.537" />
   </ItemGroup>
   <ItemGroup>