chore(deps): Update dependency destination-postgresql to v8.4.0 (#557)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [destination-postgresql](https://hub.cloudquery.io) | minor | `v8.3.1` -> `v8.4.0` |

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Author: cq-bot

example_configs/parallel.yml

@@ -14,6 +14,6 @@ kind: destination
 spec:
   name: 'postgresql-REGION_PLACEHOLDER'
   path: cloudquery/postgresql
-  version: 'v8.3.1' # latest version of postgresql plugin
+  version: 'v8.4.0' # latest version of postgresql plugin
   spec:
     connection_string: ${CQ_DSN} # The CQ_DSN environment variable will be set by GitHub Action workflow

example_configs/serial.yml

@@ -11,6 +11,6 @@ kind: destination
 spec:
   name: 'postgresql'
   path: 'cloudquery/postgresql'
-  version: 'v8.3.1' # latest version of postgresql plugin
+  version: 'v8.4.0' # latest version of postgresql plugin
   spec:
     connection_string: 'postgresql://postgres:pass@localhost:5432/postgres?sslmode=disable'