audio/py-pyttsx3: Update to 2.95

• many fixes for word event timings in nsss and sapi WIP
• Resolves #142 for empty save_to_file() on darwin platform (NSSS driver)

Changelog: https://github.com/nateshmbhat/pyttsx3/compare/v2.91...v2.95

Reported by: portscout, Repology