#2849 Added ItemReader key to StateMachine Map State (#2850)

Co-authored-by: Austin Palmer <[email protected]>

Author: apalmer1377

src/cfnlint/rules/resources/stepfunctions/StateMachine.py

@@ -61,6 +61,7 @@ def _check_state_json(self, def_json, state_name, path):
                 "Iterator",
                 "ItemsPath",
                 "ItemProcessor",
+                "ItemReader",
                 "ItemSelector",
                 "ResultPath",
                 "ResultSelector",