Bump CommunityToolkit.Mvvm from 8.1.0 to 8.2.0 in /samples (#217)

Bumps [CommunityToolkit.Mvvm](https://github.com/CommunityToolkit/dotnet) from 8.1.0 to 8.2.0.
- [Release notes](https://github.com/CommunityToolkit/dotnet/releases)
- [Commits](CommunityToolkit/dotnet@v8.1.0...v8.2.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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

@@ -43,7 +43,7 @@
 
   <ItemGroup>
     <PackageReference Include="CommunityToolkit.Maui" Version="5.1.0" />
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.1.0" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.0" />
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="7.0.5" />
     <PackageReference Include="Refit.HttpClientFactory" Version="6.5.1" />
   </ItemGroup>