fix: remove unused os import to resolve lint failure

- Remove unused 'import os' statement from test_create_crew.py
- All tests still pass locally after removing unused import
- Should resolve F401 lint error in CI

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

tests/cli/test_create_crew.py

@@ -1,4 +1,3 @@
-import os
 import shutil
 import tempfile
 from pathlib import Path