[OPENJPA-3003] Bump org.postgresql:postgresql from 42.7.11 to 42.7.13 (#162)

* Bump org.postgresql:postgresql from 42.7.11 to 42.7.12

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.11 to 42.7.12.
- [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/REL42.7.11...REL42.7.12)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-version: 42.7.12
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

* Most recent postrgres version is used

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Maxim Solodovnik <solomax666@gmail.com>