Update bcrypt requirement from ~=4.2.0 to ~=4.2.1 in /app

Updates the requirements on [bcrypt](https://github.com/pyca/bcrypt) to permit the latest version.
- [Changelog](https://github.com/pyca/bcrypt/blob/main/release.py)
- [Commits](pyca/bcrypt@4.2.0...4.2.1)

---
updated-dependencies:
- dependency-name: bcrypt
  dependency-type: direct:production
...

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

app/requirements.txt

@@ -3,6 +3,6 @@ python-gvm~=24.8.0
 fastapi~=0.115.0
 python-multipart~=0.0.12
 uvicorn[standard]~=0.32.0
-bcrypt~=4.2.0
+bcrypt~=4.2.1
 python-jose[cryptography]~=3.3.0
 redis[hiredis]~=5.2.0