Apply ruff/flake8-simplify rule SIM118

Co-authored-by: Chris Markiewicz <[email protected]>

Author: DimitriPapadopoulos

tools/checkspecs.py

@@ -375,7 +375,7 @@ def test_specs(self, uri):
                         continue
                     parent_metadata = []
                     if "parent" in trait.__dict__:
-                        parent_metadata = list(trait.parent.__dict__.keys())
+                        parent_metadata = list(trait.parent.__dict__)
                     if (
                         key
                         not in allowed_keys