PostgreSQL 12 reached end of support

[kotcrab]

Is your feature request related to a problem? Please describe.
Docker files are using PostgreSQL 12, e.g. here.
This version has reached end of support a few weeks ago.

Proposed Solution
PostgreSQL version should be updated to a newer, supported version.

Additional context
It's unlikely there are breaking changes in newer versions but would be good to know explicitly what PostgreSQL versions are supported/recommended for Cadence.

[demirkayaender]

Thanks for reporting, we will take a look at this but based on its priority this might take a while.
Given we only use simple select/insert/update queries this upgrade should be trivial. If you are interested in, feel free to bump the version, run the integration tests and send a PR.