* Add matrix_bridges_msc4190_enabled flag for using msc4190 on supported mautrix bridges.

* Apply to_json to msc4190 in mautrix configs

* Add | to_json to mautrix bridge registration io.element.msc4190.

* require matrix_synapse_experimental_features_msc3202_device_masquerading_enabled for matrix_bridges_msc4190_enabled

* Also add msc4190 support for mautrix-telegram

Fix single typo Rraefik --> Traefik

Not sure why we were doing this.

LiveKit Server may utilize Valkey, but we don't configure it this way,
so there's no need to do it.

Necro-posting and notifying all subscribers for the purpose of preventing necro-posting is somewhat ironic

The action will be used to lock issues and PRs to prevent necro-posting on closed ones which have not had any activity in the past year.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4233

This doesn't make Prometheus automatically scrape metrics from LiveKit Server,
nor does it add a Grafana dashboard automatically, etc.

Still, it paves the way for that work being done.