go: Update libp2p dependencies github.com/libp2p/go-libp2p-core from 0.6.1 to 0.7.0 github.com/libp2p/go-libp2p from 0.11.0 to 0.12.0 github.com/libp2p/go-libp2p-pubsub from 0.3.6 to 0.4.0