Bump pg from 7.17.1 to 7.18.1

Bumps [pg](https://github.com/brianc/node-postgres) from 7.17.1 to 7.18.1.
- [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/pg@7.17.1...pg@7.18.1)

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

package.json

@@ -49,7 +49,7 @@
     "mocha-esm": "^1.1.1",
     "node-sass": "^4.13.1",
     "nodebrainz": "^2.1.1",
-    "pg": "^7.17.1",
+    "pg": "^7.18.1",
     "playmusic": "^2.3.0",
     "sass-loader": "^8.0.2",
     "sequelize": "^5.21.3",