fix: additional mysql 8.4 compatibility updates

src/Repository/AssignmentRepository.php

@@ -322,7 +322,7 @@ class AssignmentRepository extends ServiceEntityRepository
         $qb = $this->createQueryBuilder('assignment');
 
         $availableAssignments = $qb
-            ->select('assignment.id')
+            ->select('assignment.id', 'assignment.availableDispositions')
             ->leftJoin('assignment.dispositions', 'disposition')
             ->innerJoin('assignment.destination', 'destination')
             ->where($qb->expr()->andX(
@@ -336,7 +336,7 @@ class AssignmentRepository extends ServiceEntityRepository
                 $qb->expr()->notIn('assignment.status', ':status'),
                 $qb->expr()->isNull('assignment.deletedAt')
             ))
-            ->groupBy('assignment')
+            ->groupBy('assignment.id', 'assignment.availableDispositions')
             ->having($qb->expr()->gt('assignment.availableDispositions', $qb->expr()->count('disposition.id')))
             ->setParameter('status', [Assignment::STATUS_DRAFT, Assignment::STATUS_CALLED_OFF])
             ->setParameter('now', new \DateTimeImmutable())