message: fix: Use utils.json_iso_dttm_ser to dump jsons when async query execution
  * Use utils.json_iso_dttm_ser to dump jsons
  If encoding is not `None`, the default encoder `utils.json_iso_dttm_ser` is not used for binary data and instead tries to encode to the default 'utf-8'.
  This fixes
  * Change to comply with tox -m pre-commit
diff: @@ -2172,7 +2172,9 @@ class Superset(BaseSupersetView): # pylint: disable=too-many-public-methods
  obj = apply_display_max_row_limit(obj, rows)
  return json_success(
  - json.dumps(obj, default=utils.json_iso_dttm_ser, ignore_nan=True)
  + json.dumps(
  + obj, default=utils.json_iso_dttm_ser, ignore_nan=True, encoding=None
  + )
  )
  @has_access_api
  