Bump mimemagic from 0.3.6 to 0.3.7
Bump mimemagic from 0.3.6 to 0.3.7

Bumps [mimemagic](https://github.com/mimemagicrb/mimemagic) from 0.3.6 to 0.3.7.
- [Release notes](https://github.com/mimemagicrb/mimemagic/releases)
- [Changelog](https://github.com/mimemagicrb/mimemagic/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mimemagicrb/mimemagic/commits/v0.3.7)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
dwilkie/pumi_app,dwilkie/pumi_app,dwilkie/pumi_app