Regression since ba0a4e864a

A lot of services are yet to be updated to start connecting to
`devture_postgres_container_network` as an additional network.
Many are already done, but I'll go through all the others later.

[#3082] Analog Signal spaces configuration with rest of playbook

Add keepalive on worker upstreams and use persistent connections

Fixes: https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3082

Related to: https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3079

Putting each client into its own network was good for isolation,
but it's quite wasteful in terms of the container network pool.