fix: do not modify options object, use defaultScopes (#399)

Regenerated the library using
[gapic-generator-typescript](https://github.com/googleapis/gapic-generator-typescript)
v1.2.1.

Author: alexander-fenster

packages/google-cloud-kms/package.json

@@ -45,7 +45,7 @@
     "api-documenter": "api-documenter yaml --input-folder=temp"
   },
   "dependencies": {
-    "google-gax": "^2.1.0"
+    "google-gax": "^2.9.2"
   },
   "devDependencies": {
     "@types/mocha": "^8.0.0",