fix(deps): require google-gax v2.12.0 (#270)

Author: alexander-fenster

package.json

@@ -25,7 +25,7 @@
     "reCAPTCHA Enterprise API"
   ],
   "dependencies": {
-    "google-gax": "^2.9.2"
+    "google-gax": "^2.12.0"
   },
   "devDependencies": {
     "@types/mocha": "^8.0.0",