chore(deps): Update dependency destination-postgresql to v8 (#698)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [destination-postgresql](https://hub.cloudquery.io) | major | `v7.6.0` -> `v8.0.0` |

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transformations/gcp/asset-inventory-free/tests/postgres.yml

@@ -11,7 +11,7 @@ spec:
   name: "postgresql"
   path: "cloudquery/postgresql"
   registry: cloudquery
-  version: "v7.6.0" # latest version of postgresql plugin
+  version: "v8.0.0" # latest version of postgresql plugin
   spec:
     batch_size: 10000
     connection_string: ${CQ_DSN}