build(deps): Bump pg from 7.17.1 to 7.18.0

Bumps [pg](https://github.com/brianc/node-postgres) from 7.17.1 to 7.18.0.
- [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/compare/pg@7.17.1...pg@7.18.0)

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

package.json

@@ -27,7 +27,7 @@
     "boom": "7.3.0",
     "csv-string": "3.1.7",
     "debug": "4.1.1",
-    "pg": "7.17.1",
+    "pg": "7.18.0",
     "pg-copy-streams": "2.2.2",
     "rimraf": "3.0.1",
     "upath": "1.2.0"