fix: resolve test error

Signed-off-by: David van der Spek <david.vanderspek@flyrlabs.com>

Author: davidspek

postgresql/resource_postgresql_database_test.go

@@ -387,7 +387,8 @@ func checkTableOwnership(
 	t *testing.T, dsn, owner, tableName string,
 ) resource.TestCheckFunc {
 	return func(s *terraform.State) error {
-		db, err := sql.Open("postgres", dsn)
+		client := testAccProvider.Meta().(*Client)
+		db, err := client.Connect()
 		if err != nil {
 			t.Fatalf("could not create connection pool: %v", err)
 		}