chore(deps): update dependency google-cloud-bigquery to v2.6.0 (#85)

Author: renovate-bot

dlp/snippets/requirements.txt

@@ -2,4 +2,4 @@ google-cloud-dlp==3.0.0
 google-cloud-storage==1.33.0
 google-cloud-pubsub==1.7.0
 google-cloud-datastore==1.15.3
-google-cloud-bigquery==2.5.0
+google-cloud-bigquery==2.6.0