Make mix ecto.dump work | Upgrade dev image postgresql-client

[PragTob]

mix ecto.dump is helpful to look at the database structure.

Sadly this fails currently:

root@a24346dbfa92:/app# mix ecto.dump

19:40:50.490 [info] Loading System Certificates
** (Mix) The structure for Mindwendel.Repo couldn't be dumped: pg_dump: error: server version: 15.8 (Debian 15.8-1.pgdg120+1); pg_dump version: 13.16 (Debian 13.16-0+deb11u1)
pg_dump: error: aborting because of server version mismatch

I fear that this requires an OS upgrade or some other workaround.

[JannikStreek]

OS upgrade with the docker image shouldn't be too bad / hard? Also a good idea to update the OS if we are based on an old image.

[nwittstruck]

I've upgraded debian as part of #484 - does this solve this issue?

[PragTob]

Läuft!

root@c327688327c2:/app# mix ecto.dump
The structure for Mindwendel.Repo has been dumped to /app/priv/repo/structure.sql in 145 ms