use sendQuery if no return is expected

src/test/resources/fixtures/init.sql

@@ -72,4 +72,13 @@ $$
 BEGIN
     resource = json_build_object('id', 1, 'name', 'changedName');
 END;
-$$;
+$$;
+
+CREATE OR REPLACE FUNCTION function_void (name text default 'plop') returns void
+    LANGUAGE plpgsql
+AS
+$$
+BEGIN
+    PERFORM 1;
+END;
+$$