chore(deps): update dependency google-cloud-bigquery to v2.6.2 (#150)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-logging==2.0.2
 google-cloud-storage==1.35.0
 google-cloud-pubsub==2.2.0
-google-cloud-bigquery==2.6.1
+google-cloud-bigquery==2.6.2