fix: update @pgsql/types dep to ^18.0.0 in versions/18

The v18 package was published with @pgsql/types: '^17.6.2' which causes
downstream consumers to resolve two copies of @pgsql/types (17.x and 18.x),
leading to TypeScript type conflicts.

Author: pyramation

versions/18/package.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {},
   "dependencies": {
-    "@pgsql/types": "^17.6.2"
+    "@pgsql/types": "^18.0.0"
   },
   "keywords": [
     "sql",