fix big int crash in json_snippets – actually use a big integer

Author: silmeth

tests/snippets/json_snippet.py

@@ -68,6 +68,6 @@ class Dict(dict): pass
 # big ints should not crash VM
 # TODO: test for correct output when actual serialization implemented and doesn’t throw
 try:
-  json.dumps(7*500)
+  json.dumps(7**500)
 except:
   pass