add error 422 handling for change_user_password function

Author: sszepe

dspace_rest_client/client.py

@@ -1511,6 +1511,11 @@ def change_user_password(self, user_uuid, current_password, new_password):
         if r.status_code == 200:
             logging.info("Updated Password for user %s", user_uuid)
             return True
+        elif r.status_code == 422:
+            logging.error(
+                "Password does not respect the rules configured in the regular expression."
+            )
+            return False
         else:
             logging.error("An error occurred updating the password.")
             return False