Bump mongoose from 5.6.2 to 5.7.5 (#57)

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.6.2 to 5.7.5.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.6.2...5.7.5)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Christoph Werner <[email protected]>

Author: dependabot[bot]