feat: update go-waku version

[richard-ramos]

• removes encoding functions from relay and lightpush
• adds encode_symmetric and encode_asymmetric to WakuMessage
• return an error instead of panics in decode_and_free_response

May fix #66

[hopeyen]

confirmed this fixes #66 🎉 💯 Thanks very much for the collaboration! :shipit: 📦