Update to 2.24.2
    
    - improve _return_false() and remove _commit_or_forward_key_event_or_return_false()
      (Resolves: https://github.com/mike-fabian/ibus-typing-booster/issues/463)
    - Make characters for Biángbiángmiàn easily searchable
    - emoji-picker: Update default for current Unicode release 15.1