message: fix: remove unused dependencies
diff: "@types/duplexify": "^3.6.0",
  "@types/long": "^4.0.0",
  "arrify": "^2.0.0",
  - "async-each": "^1.0.1",
  "extend": "^3.0.2",
  "google-auth-library": "^6.0.0",
  "google-gax": "^2.1.0",
  "jsdoc-fresh": "^1.0.1",
  "jsdoc-region-tag": "^1.0.2",
  "linkinator": "^2.0.0",
  - "mkdirp": "^1.0.0",
  "mocha": "^7.0.0",
  "mv": "^2.1.1",
  "ncp": "^2.0.0",
  