Bump mongoose from 4.6.5 to 5.7.5

Bumps [mongoose](https://github.com/Automattic/mongoose) from 4.6.5 to 5.7.5.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](https://github.com/Automattic/mongoose/compare/4.6.5...5.7.5

)

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