Upgrade PostgreSQL JDBC driver and sync PostgreSQL Docker tags

[volphy]

Current code from the main branch uses PostgreSQL JDBC driver 42.2.4

zally/server/zally-server/build.gradle.kts

Line 38 in e9e603a

implementation("org.postgresql:postgresql:42.2.4")

Unfortunately, this version contains several known security vulnerabilities.

The latest relaased version of the driver seems to fix them:
https://jdbc.postgresql.org/documentation/changelog.html#version_42.3.2

I have also found the following PostgreSQL Docker image tag discrepancy:

zally/docker-compose.yaml

Line 48 in e9e603a

image: postgres:13

(13.x)
vs

zally/docker-compose-bark.yaml

Line 26 in e9e603a

image: postgres:9.6

Is it on purpose?

I have verified locally that Zally works after upgrading the JDBC driver and syncing Docker tags of the PostgreSQL Docker images used.

Can these changes be applied to the main branch and appear in the next release?