fix: correct ORDER BY clause for date filtering query [#5]

The original ORDER BY included a field that was not present in the GROUP BY clause or any aggregate function

src/Infrastructure/Persistence/Orm/Repository/DoctrineOrmAvailableDatesMediaRepository.php

@@ -29,7 +29,8 @@ public function getAll(): array
             ->createQueryBuilder('m')
             ->select('YEAR(m.createdAt) as year', 'MONTH(m.createdAt) as month', 'count(m) as count')
             ->groupBy('year', 'month')
-            ->orderBy('m.createdAt', 'ASC')
+            ->orderBy('year', 'ASC')
+            ->addOrderBy('month', 'ASC')
             ->getQuery()
             ->getResult();
     }