Add missing slash in url scheme for mediaUrl

add etherpad to nginx wanted services

using b33ea48

it's required if enabled by the dimension config here:
6eb8fb8392/roles/matrix-etherpad/tasks/init.yml (L42-L49)

see also #1517

Updated: prom-postgres-exporter to v0.10.1

only enable openssl if necessary, closes #1510

matrix-bot-honoroit: bugfix commands in reply-to mode, add custom prefixes for thread topics

Upgrade synapse-simple-antispam (0.0.3 -> 0.0.7)

v1.50.0 was found to be buggy for people using a `webclient` listener.
This is fixed in v1.50.1.

We don't use such a listener, so we weren't affected anyway.

Updated: element-web to v1.9.9

Updated: Certbot to v1.22.0

Updated: mautrix-twitter to v0.1.3

Added: mautrix-whatsapp v0.2.3 tag

Added: mautrix-signal 0.2.2 & signald 0.16.1

Updated: telegram to v0.11.1

Updated Honoroit with fallback reply-to mode

Added Instagram version tag instead of latest

Updated: version to stable-6726-2

Updated: node-exporter to v1.3.1

Updated: slack to 1.10.0

Updated: sygnal to v0.11.0

Updated: webhooks image tag to v1.0.3-01

Updated: ddclient to v3.9.1-ls76

Updated: beeper-linkedin to v0.5.2