`to_js` does not accept `dict_converter` like the pyodide version

[trungleduc]

to_js function from pyodide accept the dict_converter argument which is used by pyodide-http in the streaming mode. Using this mode in xeus-python crash because to_js here does not accept this argument.

[trungleduc]

cc @DerThorsten. And @martinRenou might get hit by this while working with the sharedarraybuffer