message: fix(sqllab): menu link results in 404
diff: @@ -2873,7 +2873,7 @@ class Superset(BaseSupersetView): # pylint: disable=too-many-public-methods
  @has_access
  @event_logger.log_this
  - @expose("/sqllab", methods=["GET", "POST"])
  + @expose("/sqllab/", methods=["GET", "POST"])
  def sqllab(self) -> FlaskResponse:
  """SQL Editor"""
  payload = {
  