Jitsi migrated image publishing from Docker Hub to the GitHub Container
Registry, and the new registry carries no tag history, so this also moves
Jitsi to stable-11146-1. That release makes the containers rootless and runs
them with a read-only root filesystem.

`jitsi_jvb_container_colibri_ws_host_bind_port` goes away with it. Colibri
WebSocket support was removed upstream in favour of SCTP data channels, so
the Jitsi Video Bridge no longer serves HTTP at all and needs no
reverse-proxy routing.