Bump engines since we do not test lower than 16 anymore (#3490)

Author: brianc

packages/pg/package.json

@@ -73,6 +73,6 @@
   ],
   "license": "MIT",
   "engines": {
-    "node": ">= 8.0.0"
+    "node": ">= 16.0.0"
   }
 }