Bump pg from 7.12.0 to 8.5.1

Bumps [pg](https://github.com/brianc/node-postgres) from 7.12.0 to 8.5.1.
- [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/compare/v7.12.0...pg@8.5.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -15,7 +15,7 @@
     "express": "^4.17.1",
     "morgan": "^1.9.1",
     "node-statsd": "^0.1.1",
-    "pg": "^7.8.0",
+    "pg": "^8.5.1",
     "pug": "^2.0.4",
     "serve-favicon": "^2.5.0"
   }