Eclipse Paho 1.4.3 (Go v3 client)

https://github.com/eclipse/paho.mqtt.golang/releases/tag/v1.4.3

Release 1.4.3 is a relatively small release to bring in changes made in the eight months since 1.4.2.

What's Changed

• Avoid Panic when keepalive is 1 by @tomatod in #622
• Allow MQTT username/password in websocket URI @MattBrittan in #624
• Add backoff when reconnecting following immediate connection loss @tomatod in #625
• Update dependencies (github.com/gorilla/websocket@v1.5.0, golang.org/x/net, golang.org/x/sync) and specify go 1.18 in go.mod.

Full Changelog: v1.4.2...v1.4.3