Bump the production-dependencies group with 2 updates (#139)

Bumps the production-dependencies group with 2 updates: [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) and [pg-cursor](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg-cursor).


Updates `pg` from 8.20.0 to 8.21.0
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.21.0/packages/pg)

Updates `pg-cursor` from 2.19.0 to 2.20.0
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg-cursor@2.20.0/packages/pg-cursor)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 8.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
- dependency-name: pg-cursor
  dependency-version: 2.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
...

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Author: dependabot[bot]