Bump pg from 8.11.5 to 8.12.0 (#696)

Bumps [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) from 8.11.5 to 8.12.0.
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.12.0/packages/pg)

---
updated-dependencies:
- dependency-name: pg
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]