Bump migrate-mongo from 11.0.0 to 12.1.2 in /npm

Bumps [migrate-mongo](https://github.com/seppevs/migrate-mongo) from 11.0.0 to 12.1.2.
- [Changelog](https://github.com/seppevs/migrate-mongo/blob/master/CHANGELOG.md)
- [Commits](seppevs/migrate-mongo@v11.0.0...v12.1.2)

---
updated-dependencies:
- dependency-name: migrate-mongo
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>