Fix linting issues in test file

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/test_optional_dependencies.py

@@ -1,8 +1,10 @@
 import importlib
 import sys
 from unittest import mock
+
 import pytest
 
+
 def test_rag_storage_without_chromadb():
     # Mock the import to simulate chromadb not being installed
     with mock.patch.dict(sys.modules, {'chromadb': None}):