fix(Postgres Node): Connection pool of the database object has been destroyed (#7074)

Github issue / Community forum post (link here to close automatically):

packages/nodes-base/nodes/Postgres/v2/actions/router.ts

@@ -57,7 +57,8 @@ export async function router(this: IExecuteFunctions): Promise<INodeExecutionDat
 		if (sshClient) {
 			sshClient.end();
 		}
-		pgp.end();
+
+		await db.$pool.end();
 	}
 
 	return this.prepareOutputData(returnData);