Merge pull request #3133 from Flow-Launcher/dependabot/nuget/CommunityToolkit.Mvvm-8.4.0

Bump CommunityToolkit.Mvvm from 8.3.2 to 8.4.0

Author: jjw24

Flow.Launcher/Flow.Launcher.csproj

@@ -83,7 +83,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.3.2" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
     <PackageReference Include="Fody" Version="6.5.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>