Bump strong_migrations from 0.7.8 to 0.7.9 (#17166)

Bump strong_migrations from 0.7.8 to 0.7.9 (#17166)

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.7.8 to 0.7.9.
- [Release notes](https://github.com/ankane/strong_migrations/releases)
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/strong_migrations/compare/v0.7.8...v0.7.9)

---
updated-dependencies:
- dependency-name: strong_migrations
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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