chore: linter issues

Author: Kohulan

tests/test_pubchem_client.py

@@ -1,11 +1,11 @@
 import unittest
 from unittest.mock import patch, MagicMock
 import pytest
-import requests
 from requests.exceptions import RequestException
 
 from app.modules.pubchem_retrieve import PubChemClient
 
+
 # Mock client class to replace TestClient
 class MockClient:
     """Simple mock client to replace TestClient"""