fix(deps): require google-gax v2.12.0 (#373)

Author: alexander-fenster

packages/google-cloud-securitycenter/package.json

@@ -44,7 +44,7 @@
     "Security Command Center API"
   ],
   "dependencies": {
-    "google-gax": "^2.9.2"
+    "google-gax": "^2.12.0"
   },
   "devDependencies": {
     "@types/mocha": "^8.0.0",