stable-8138: release

* 1e49d65 web: simplify build
* dd399fe web,jvb: remove ENABLE_MULTISTREAM
* 723d661 jibri: add single-use-mode config option
* ca14c52 web: add more transcription config env vars
* ccc5746 prosody: add ability to configure TURN server transports
* 17d047a misc: working on unstable