security/py-gtts-token: Deprecate port

• Since changes were made to Google's TTS API in November 2020 this port is no longer useful [1].
  
  [1] https://github.com/Boudewijn26/gTTS-token/blob/master/README.md

• The audio/py-gtts port has been adapted accordingly to the new API changes and has been updated in r559351 .