Bump bcrypt from 3.2.2 to 4.0.0 in /api

Bumps [bcrypt](https://github.com/pyca/bcrypt) from 3.2.2 to 4.0.0.
- [Release notes](https://github.com/pyca/bcrypt/releases)
- [Changelog](https://github.com/pyca/bcrypt/blob/main/release.py)
- [Commits](https://github.com/pyca/bcrypt/compare/3.2.2...4.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

api/requirements.txt

@@ -7,7 +7,7 @@ pymysql==1.0.2
 pyjwt==2.3.0
 apiflask==1.0.0
 flask-cors==3.0.10
-bcrypt==3.2.2
+bcrypt==4.0.0
 pytest~=7.1.2
 pytest-cov
 marshmallow~=3.15.0