fixed FLAKE8 error given by import pydantic

Author: alixdamman

larray/tests/test_checked_session.py

@@ -1,7 +1,7 @@
 import pytest
 
 try:
-    import pydantic
+    import pydantic         # noqa: F401
 except ImportError:
     pytestmark = pytest.mark.skip("pydantic is required for testing Checked* classes")