Bump CommunityToolkit.Mvvm from 8.4.0 to 8.4.2 (#424)

---
updated-dependencies:
- dependency-name: CommunityToolkit.Mvvm
  dependency-version: 8.4.2
  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]

src/CommunityToolkit.Maui.Markup.Benchmarks/CommunityToolkit.Maui.Markup.Benchmarks.csproj

@@ -18,7 +18,7 @@
   <ItemGroup>
     <PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" Condition="'$(OS)' == 'Windows_NT'" />
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.3.0" />
     <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiPackageVersion)" />
   </ItemGroup>