chore(deps): Bump CommunityToolkit.Mvvm from 8.4.0 to 8.4.2

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

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

Author: dependabot[bot]

src/NexusCad.Admin/NexusCad.Admin.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.2" />
     <PackageReference Include="Fluent.Ribbon" Version="11.0.0" />
     <PackageReference Include="MahApps.Metro.IconPacks.Material" Version="5.1.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.1" />