Update pg requirement from ^8.6.0 to ^8.7.1
Update pg requirement from ^8.6.0 to ^8.7.1

Updates the requirements on [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) to permit the latest version.
- [Release notes](https://github.com/brianc/node-postgres/releases)
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.7.1/packages/pg)

---
updated-dependencies:
- dependency-name: pg
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ioBroker/ioBroker.sql