Bump CommunityToolkit.Mvvm from 8.1.0 to 8.4.0#9

dependabot[bot] wants to merge 1 commit into8.0.1xx-sr1-preview-versioningRatneshByteCraft/TestRepository:8.0.1xx-sr1-preview-versioningfrom

dependabot/nuget/src/Controls/samples/Controls.Sample/CommunityToolkit.Mvvm-8.4.0RatneshByteCraft/TestRepository:dependabot/nuget/src/Controls/samples/Controls.Sample/CommunityToolkit.Mvvm-8.4.0Copy head branch name to clipboard