Bump CommunityToolkit.Mvvm from 8.4.0 to 8.4.2 (#420)

---
updated-dependencies:
- dependency-name: CommunityToolkit.Mvvm
  dependency-version: 8.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: CommunityToolkit.Mvvm
  dependency-version: 8.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

samples/CommunityToolkit.Maui.Markup.Sample/CommunityToolkit.Maui.Markup.Sample.csproj

@@ -63,7 +63,7 @@
     <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiPackageVersion)" />
     <PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiPackageVersion)" />
     <PackageReference Include="CommunityToolkit.Maui" Version="$(MauiCommunityToolkitPackageVersion)" />
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.2" />
     <PackageReference Include="Microsoft.Extensions.Http.Resilience" Version="10.0.0" />
     <PackageReference Include="Refit.HttpClientFactory" Version="10.1.6" />
   </ItemGroup>