fix part 3

backend/app/auth/jwt.py

@@ -1,6 +1,6 @@
 """JWT token generation and validation."""
 
-from datetime import datetime, timedelta, timezone
+from datetime import UTC, datetime, timedelta
 from uuid import UUID
 
 from jose import JWTError, jwt
@@ -21,11 +21,11 @@ def create_access_token(user_id: UUID, email: str, expires_delta: timedelta | No
         Encoded JWT token string
     """
     if expires_delta:
-        expire = datetime.now(timezone.utc) + expires_delta
+        expire = datetime.now(UTC) + expires_delta
     else:
-        expire = datetime.now(timezone.utc) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+        expire = datetime.now(UTC) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
 
-    to_encode = {"sub": str(user_id), "email": email, "exp": expire, "iat": datetime.now(timezone.utc), "type": "access"}
+    to_encode = {"sub": str(user_id), "email": email, "exp": expire, "iat": datetime.now(UTC), "type": "access"}
 
     encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
     return encoded_jwt