Bump CommunityToolkit.Mvvm from 8.4.0 to 8.4.2#17

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mainQianyiaz/AvaloniaIDE:mainfrom

dependabot/nuget/AvaloniaIDE/CommunityToolkit.Mvvm-8.4.2Qianyiaz/AvaloniaIDE:dependabot/nuget/AvaloniaIDE/CommunityToolkit.Mvvm-8.4.2Copy head branch name to clipboard