♻️ Replace deprecated utcnow() with now(timezone.utc) in utils module (#1247)

backend/app/core/security.py

@@ -1,4 +1,4 @@
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from typing import Any
 
 import jwt
@@ -13,7 +13,7 @@ ALGORITHM = "HS256"
 
 
 def create_access_token(subject: str | Any, expires_delta: timedelta) -> str:
-    expire = datetime.utcnow() + expires_delta
+    expire = datetime.now(timezone.utc) + expires_delta
     to_encode = {"exp": expire, "sub": str(subject)}
     encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
     return encoded_jwt