chore(deps): update dependency google-cloud-storage to v2.8.0 (#179)

Author: renovate-bot

bigquery-migration/snippets/requirements-test.txt

@@ -1,4 +1,4 @@
 pytest==7.2.2
 google-cloud-testutils==1.3.3
 google-api-core==2.11.0
-google-cloud-storage==2.7.0
+google-cloud-storage==2.8.0