refactor: remove unused datetime import and update version workflow docs

docs/update_workflow.md

@@ -1,5 +1,7 @@
 # Version update
 
+Here is the workflow for updating the version of the project. 
+
 1. Update version in `pyproject.toml`
 2. Update version in `uv.lock`
 3. Update version in `src/app.py`
@@ -9,3 +11,4 @@
 7. Commit changes
 8. Tag release
 9. Push changes
+10. Export docker image to tar file. File name should be `eurovision-25-backend-{version}.tar`

src/routes/users.py

@@ -5,7 +5,6 @@ from models.msg import Message
 from lib.db import get_connection
 from lib.logger import logger
 from lib.helpers import hash_password
-from datetime import datetime
 
 router = APIRouter(prefix="/users", tags=["users"])