chore(deps): Update dependency source-gcp to v19.8.4

Author: cq-bot

bench_configs/source_gcp.yml

@@ -2,7 +2,7 @@ kind: source
 spec:
   name: "gcp"
   path: "cloudquery/gcp"
-  version: "v19.8.3" # latest version of source gcp plugin
+  version: "v19.8.4" # latest version of source gcp plugin
   tables: ["*"]
   destinations: ${DESTINATIONS}
   skip_dependent_tables: true