chore(deps): bump psycopg from 3.1.18 to 3.1.19 in /backend (#12)

Bumps [psycopg](https://github.com/psycopg/psycopg) from 3.1.18 to 3.1.19.
- [Changelog](https://github.com/psycopg/psycopg/blob/master/docs/news.rst)
- [Commits](psycopg/psycopg@3.1.18...3.1.19)

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

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