Bump mini_magick from 4.8.0 to 4.9.1
Bump mini_magick from 4.8.0 to 4.9.1

Bumps [mini_magick](https://github.com/minimagick/minimagick) from 4.8.0 to 4.9.1.
- [Release notes](https://github.com/minimagick/minimagick/releases)
- [Changelog](https://github.com/minimagick/minimagick/blob/master/CHANGELOG.md)
- [Commits](https://github.com/minimagick/minimagick/compare/v4.8.0...v4.9.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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