Fix TypeError in python-update-import

Author: msimacek

mx.graalpython/mx_graalpython.py

@@ -834,7 +834,7 @@ def update_import_cmd(args):
         d = {}
         with open(suite_py) as f:
             exec(f.read(), d, d) # pylint: disable=exec-used;
-        for suite in dict["suite"].get("imports", {}).get("suites", []):
+        for suite in d["suite"].get("imports", {}).get("suites", []):
             import_name = suite["name"]
             if suite.get("version") and import_name not in local_names:
                 imports_to_update.add(import_name)