fix(deps): update dependency google-gax to v5 (#575)

Co-authored-by: Leah E. Cole <6719667+leahecole@users.noreply.github.com>

Author: renovate-bot

samples/package.json

@@ -17,7 +17,7 @@
     "@google-cloud/bigquery-storage": "^5.1.0",
     "google-auth-library": "^10.0.0",
     "avsc": "^5.4.18",
-    "google-gax": "^4.3.1",
+    "google-gax": "^5.0.0",
     "protobufjs": "^7.2.4",
     "snappy": "^7.0.0"
   },