skip noerror_on_sync_code if python version is too low to parse the code

Author: jakkdl

tests/test_flake8_async.py

@@ -543,6 +543,7 @@ def visit_AsyncFor(self, node: ast.AsyncFor):
 def test_noerror_on_sync_code(test: str, path: Path):
     if any(e in test for e in error_codes_ignored_when_checking_transformed_sync_code):
         return
+    check_version(test)
     with tokenize.open(path) as f:
         source = f.read()
     tree = SyncTransformer().visit(ast.parse(source))