Update pylint/checkers/refactoring/recommendation_checker.py

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>

pylint/checkers/refactoring/recommendation_checker.py

@@ -90,7 +90,7 @@ def _check_consider_iterating_dictionary(self, node: nodes.Call) -> None:
             and any(
                 op
                 for op, comparator in comp_ancestor.ops
-                if op in ["in", "not in"]
+                if op in {"in", "not in"}
                 and (comparator in node.node_ancestors() or comparator is node)
             )
         ):