browser (bridge): workaround to fix unicode dumping of JSON: in Brython 3.11, emoji are broken when dumped/parsed with `ensure_ascii`, and using `ensure_ascii=False` is not working (see https://github.com/brython-dev/brython/issues/2331). This work around this and https://github.com/brython-dev/brython/issues/2332 to make sure that emoji are transmitted correctly to other tabs.