chore(deps): bump semver and pg

Removes [semver](https://github.com/npm/node-semver). It's no longer used after updating ancestor dependency [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg). These dependencies need to be updated together.


Removes `semver`

Updates `pg` from 8.3.0 to 8.17.1
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.17.1/packages/pg)

---
updated-dependencies:
- dependency-name: semver
  dependency-version: 
  dependency-type: indirect
- dependency-name: pg
  dependency-version: 8.17.1
  dependency-type: direct:production
...

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Author: dependabot[bot]