chore(deps): update dependency @google-cloud/bigquery to v6 (#275)

Author: renovate-bot

packages/google-cloud-bigquery-storage/samples/package.json

@@ -19,7 +19,7 @@
     "snappy": "^7.0.0"
   },
   "devDependencies": {
-    "@google-cloud/bigquery": "^5.9.3",
+    "@google-cloud/bigquery": "^6.0.0",
     "c8": "^7.0.0",
     "chai": "^4.2.0",
     "mocha": "^8.0.0",