fix: use compatible version of google-gax

* fix: use compatible version of google-gax

* fix: use gax v1.6.3

Author: alexander-fenster

package.json

@@ -57,7 +57,7 @@
     "escape-string-regexp": "^2.0.0",
     "extend": "^3.0.2",
     "google-auth-library": "^5.0.0",
-    "google-gax": "^1.0.0",
+    "google-gax": "^1.6.3",
     "is": "^3.0.1",
     "is-utf8": "^0.2.1",
     "lodash.snakecase": "^4.1.1",