Bump psycopg from 3.1.15 to 3.1.18

Bumps [psycopg](https://github.com/psycopg/psycopg) from 3.1.15 to 3.1.18.
- [Changelog](https://github.com/psycopg/psycopg/blob/master/docs/news.rst)
- [Commits](psycopg/psycopg@3.1.15...3.1.18)

---
updated-dependencies:
- dependency-name: psycopg
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>