build(deps): bump bcrypt from 3.1.15 to 3.1.16
build(deps): bump bcrypt from 3.1.15 to 3.1.16

Bumps [bcrypt](https://github.com/codahale/bcrypt-ruby) from 3.1.15 to 3.1.16.
- [Release notes](https://github.com/codahale/bcrypt-ruby/releases)
- [Changelog](https://github.com/codahale/bcrypt-ruby/blob/master/CHANGELOG)
- [Commits](https://github.com/codahale/bcrypt-ruby/compare/v3.1.15...v3.1.16)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
openmensa/openmensa,openmensa/openmensa,openmensa/openmensa,openmensa/openmensa