⬆ Bump bcrypt from 4.3.0 to 5.0.0 in /backend

Bumps [bcrypt](https://github.com/pyca/bcrypt) from 4.3.0 to 5.0.0.
- [Changelog](https://github.com/pyca/bcrypt/blob/main/CHANGELOG.rst)
- [Commits](pyca/bcrypt@4.3.0...5.0.0)

---
updated-dependencies:
- dependency-name: bcrypt
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/pyproject.toml

@@ -19,7 +19,7 @@ dependencies = [
     "psycopg[binary]<4.0.0,>=3.1.13",
     "sqlmodel<1.0.0,>=0.0.21",
     # Pin bcrypt to 4.0.x for passlib compatibility
-    "bcrypt>=4.0.0,<4.1.0",
+    "bcrypt>=4.0.0,<5.1.0",
     "pydantic-settings<3.0.0,>=2.2.1",
     "sentry-sdk[fastapi]<2.0.0,>=1.40.6",
     "pyjwt<3.0.0,>=2.8.0",