Update dependency CommunityToolkit.Mvvm to 8.4.2 (#81)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -6,7 +6,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="Blurhash.Core" Version="4.0.0" />
-    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.1" />
+    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.2" />
     <PackageVersion Include="Jellyfin.Sdk" Version="2025.10.21" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.5" />
     <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.5" />