skip testing test_checked_session.py if pydantic is not installed (bis)

Author: alixdamman

larray/tests/test_checked_session.py

@@ -3,7 +3,7 @@
 try:
     import pydantic
 except ImportError:
-    pytestmark = pytest.skip("pydantic is required for testing Checked* classes")
+    pytestmark = pytest.mark.skip("pydantic is required for testing Checked* classes")
 
 import pickle
 import numpy as np