chore: update dependency loopback-connector-postgresql to ^6.0.3

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

acceptance/repository-postgresql/package-lock.json

@@ -37,7 +37,7 @@
     "@loopback/repository-tests": "^0.21.10",
     "@loopback/testlab": "^5.0.10",
     "@types/node": "^14.18.42",
-    "loopback-connector-postgresql": "^6.0.2",
+    "loopback-connector-postgresql": "^6.0.3",
     "tslib": "^2.5.0"
   }
 }