chore: upgrade phpunit to 12.5

tests/Validator/SeasonAssignmentValidatorTest.php

@@ -10,6 +10,7 @@ use App\Entity\Teamer;
 use App\Repository\SeasonAssignmentRepository;
 use App\Validator\Constraints\SeasonAssignment as SeasonAssignmentConstraint;
 use App\Validator\Constraints\SeasonAssignmentValidator;
+use PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations;
 use PHPUnit\Framework\MockObject\MockObject;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
@@ -18,6 +19,7 @@ use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
  * pinned here is which season window a given assignment is counted against, and the cases that
  * must not be refused - an unstaffed assignment, and the assignment being edited itself.
  */
+#[AllowMockObjectsWithoutExpectations]
 class SeasonAssignmentValidatorTest extends ConstraintValidatorTestCase
 {
     private SeasonAssignmentRepository&MockObject $repository;