deps: Update dependency @googleapis/sqladmin to v31

Author: renovate-bot

package-lock.json

@@ -83,7 +83,7 @@
     "url": "git+https://github.com/GoogleCloudPlatform/cloud-sql-nodejs-connector"
   },
   "dependencies": {
-    "@googleapis/sqladmin": "^29.0.0",
+    "@googleapis/sqladmin": "^31.0.0",
     "gaxios": "^7.0.0",
     "google-auth-library": "^9.2.0",
     "p-throttle": "^7.0.0"