fix(deps): update dependency google-gax to v1 (#280)

Author: renovate[bot]

packages/google-privacy-dlp/package.json

@@ -42,7 +42,7 @@
     "predocs-test": "npm run docs"
   },
   "dependencies": {
-    "google-gax": "^0.26.0",
+    "google-gax": "^1.0.0",
     "lodash.merge": "^4.6.0",
     "protobufjs": "^6.8.0"
   },