## Description
PR to update the version references for postgres. This will help us in
keeping the diff minimum between release and pg branch as we will be
upgrading the postgres version to 15 on pg branch.
## Automation
/ok-to-test tags=""
### 🔍 Cypress test results
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## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Chores**
- Updated Docker scripts to use a generic placeholder for PostgreSQL
version, enhancing flexibility and future-proofing the setup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
When PostgreSQL starts, we see the following errors in the logs:
```
mkdir:
cannot create directory ‘/tmp/appsmith/postgres-stats’
: Permission denied
```
And then this over and over again:
```
postgres stdout | 2023-09-19 15:34:34.504 UTC [1759] LOG: could not open temporary statistics file "/tmp/appsmith/postgres-stats/global.tmp": No such file or directory
```
The problem is that in `postgres.conf`, we set `user=postgres`, which
doesn't have access to create things in `/tmp`.
This PR removes this configuration and lets the default be, which will
be a temp folders _under_ the data directory.
