Update mongo
Update mongo

Changes:

- https://github.com/docker-library/mongo/commit/57a4239: Update 4.2-rc to 4.2.18-rc0
- https://github.com/docker-library/mongo/commit/f904e63: Handle "4.2-rc" gracefully
- https://github.com/docker-library/mongo/commit/e7ad580: Merge pull request https://github.com/docker-library/mongo/pull/516 from infosiftr/no-rapids
- https://github.com/docker-library/mongo/commit/b1daa35: Remove outdated TODO
- https://github.com/docker-library/mongo/commit/d477d48: Explicitly skip all "rapid releases"

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