chore(deps): bump pg from 8.5.1 to 8.8.0 (#4614)

Bumps [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) from 8.5.1 to 8.8.0.
- [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@8.8.0/packages/pg)

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

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package.json

@@ -147,7 +147,7 @@
     "passport-google-oauth2": "^0.2.0",
     "passport-oauth2": "^1.6.1",
     "passport-slack-oauth2": "^1.1.1",
-    "pg": "^8.5.1",
+    "pg": "^8.8.0",
     "pg-hstore": "^2.3.4",
     "pg-tsquery": "^8.4.0",
     "polished": "^4.2.2",