Bump bcryptjs from 2.4.3 to 3.0.2 in /backend

Bumps [bcryptjs](https://github.com/dcodeIO/bcrypt.js) from 2.4.3 to 3.0.2.
- [Release notes](https://github.com/dcodeIO/bcrypt.js/releases)
- [Commits](dcodeIO/bcrypt.js@2.4.3...v3.0.2)

---
updated-dependencies:
- dependency-name: bcryptjs
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]