chore(deps-dev): bump pg from 8.4.2 to 8.7.3

Bumps [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) from 8.4.2 to 8.7.3.
- [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/[email protected]/packages/pg)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -62,7 +62,7 @@
     "jest-extended": "0.11.5",
     "mysql2": "2.1.0",
     "onchange": "6.0.0",
-    "pg": "8.4.2",
+    "pg": "8.7.3",
     "semantic-release": "17.4.7",
     "semantic-release-npm-deprecate-old-versions": "1.3.2",
     "semantic-release-slack-bot": "2.1.1",