Benchmark on PSQL 15 not working

I am not sure where the right repo for this issue would be, so I am filing it here, as we encountered the problem while trying to get the operator to work.

**Describe the bug**
Postgres version 15 sends/requires SNI Headers which lower versions do not send. This leads to a host of different errors and renders the operator unusable for us.

**Expected behavior**
There should exist an up-to-date version of the quay.io pgbench image. The current latest image uses the postgres 11 package, which is EOL since last year. I would have liked to provide a fix directly to the repo where the image is built but was unable to find it...

**Additional context**
We are trying to benchmark/monitor/debug our postgres installation in an azure/aks cloud

No source or image-build file is identified in the issue. Start by locating the repository or build entry point for the quay.io pgbench image and inspect how its PostgreSQL package version is selected. Done means an up-to-date image works with PostgreSQL 15 benchmarking and monitoring in the reported environment.

Written by the indexing model from the issue text.