dependabot: Bump CommunityToolkit.Mvvm from 8.2.2 to 8.4.0

---
updated-dependencies:
- dependency-name: CommunityToolkit.Mvvm
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/Stravaig.Icons.Example/Stravaig.Icons.Example.csproj

@@ -22,7 +22,7 @@
             <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
             <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
         </PackageReference>
-        <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.2"/>
+        <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0"/>
     </ItemGroup>
 
     <ItemGroup>