chore(deps): update dependency google-cloud-bigquery to v2.8.0 (#152)

Author: renovate-bot

asset/snippets/snippets/requirements.txt

@@ -2,4 +2,4 @@ google-cloud-storage==1.36.0
 google-cloud-asset==2.2.0
 google-cloud-resource-manager==0.30.3
 google-cloud-pubsub==2.2.0
-google-cloud-bigquery==2.7.0
+google-cloud-bigquery==2.8.0