Update dependency org.postgresql:postgresql to v42.5.3 (mulk/mulkcms2!15)

This MR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [org.postgresql:postgresql](https://jdbc.postgresql.org) ([source](https://github.com/pgjdbc/pgjdbc)) | build | patch | `42.5.2` -> `42.5.3` |

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