[jdbc] Update PostgreSQL JDBC driver to 42.4.3 (#13770)

[jdbc] Update PostgreSQL JDBC driver to 42.4.3 (#13770)

* Bump postgresql in /bundles/org.openhab.persistence.jdbc

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.1 to 42.4.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/compare/REL42.4.1...REL42.4.3)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
...

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>