build(deps): update dependency communitytoolkit.mvvm to 8.4.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
CommunityToolkit.Mvvm	8.4.1 → 8.4.2

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Release Notes

CommunityToolkit/dotnet (CommunityToolkit.Mvvm)

v8.4.2: 8.4.2

What's Changed

• Fix incorrect version check order in MVVMToolkitRemoveDuplicateAnalyzers target by @​Sergio0694 in #​1174

Full Changelog: CommunityToolkit/dotnet@v8.4.1...v8.4.2

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