fix(deps): require google-gax v2.17.0 (#78)

Author: Benjamin E. Coe

package.json

@@ -39,7 +39,7 @@
  "test": "c8 mocha build/test"
  },
  "dependencies": {
- "google-gax": "^2.12.0"
+ "google-gax": "^2.17.0"
  },
  "devDependencies": {
  "@types/mocha": "^8.0.3",