update MYMETA.json with current version, recommends, etc.
RT#90128 remove t/madness_json.t test 7

JSON::XS::Boolean is deprecated as of JSON::XS 3.0 and now only provides
a thin wrapper around JSON::PP::Boolean.  Since the test relied on
the (undocumented) internal structure of JSON::XS::Boolean <3.0, I
simply removed it.