chore(deps): bump bcrypt from 4.2.0 to 4.3.0 in /backend

Bumps [bcrypt](https://github.com/pyca/bcrypt) from 4.2.0 to 4.3.0.
- [Changelog](https://github.com/pyca/bcrypt/blob/main/release.py)
- [Commits](https://github.com/pyca/bcrypt/compare/4.2.0...4.3.0)

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

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

backend/requirements.txt

@@ -20,7 +20,7 @@ peewee-migrate==1.12.2
 psycopg2-binary==2.9.9
 pgvector==0.3.5
 PyMySQL==1.1.1
-bcrypt==4.2.0
+bcrypt==4.3.0
 
 pymongo
 redis