chore(deps): update dependency google-cloud-bigquery to v2.8.0 (#107)

Author: renovate-bot

packages/google-cloud-dlp/samples/snippets/requirements.txt

@@ -2,4 +2,4 @@ google-cloud-dlp==3.0.1
 google-cloud-storage==1.35.0
 google-cloud-pubsub==2.2.0
 google-cloud-datastore==2.1.0
-google-cloud-bigquery==2.7.0
+google-cloud-bigquery==2.8.0