chore(deps): bump CommunityToolkit.Mvvm in /src/shell/dotnet/Shell

Bumps [CommunityToolkit.Mvvm](https://github.com/CommunityToolkit/dotnet) from 8.2.2 to 8.3.0.
- [Release notes](https://github.com/CommunityToolkit/dotnet/releases)
- [Commits](CommunityToolkit/dotnet@v8.2.2...v8.3.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Directory.Packages.props

@@ -1,6 +1,6 @@
 <Project>
   <ItemGroup>
-    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.2.2" />
+    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.3.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.0" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.0" />
     <PackageVersion Include="CommunityToolkit.HighPerformance" Version="8.2.2" />