Update ghcr.io/cinnyapp/cinny Docker tag to v4.2.1

This MR contains the following updates:

Package	Update	Change
ghcr.io/cinnyapp/cinny	patch	v4.2.0 -> v4.2.1

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Release Notes

cinnyapp/cinny (ghcr.io/cinnyapp/cinny)

v4.2.1

Compare Source

What's Changed

• Fix auth media check for dendrite by @​kfiven in https://github.com/cinnyapp/cinny/pull/1952

Full Changelog: https://github.com/cinnyapp/cinny/compare/v4.2.0...v4.2.1

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