feat: upgrade phpunit to 12.5

tests/Validator/Constraints/MandatoryAdditionalServicesSelectedValidatorTest.php

@@ -23,7 +23,7 @@ class MandatoryAdditionalServicesSelectedValidatorTest extends ConstraintValidat
 
     protected function createValidator(): MandatoryAdditionalServicesSelectedValidator
     {
-        $this->participantEligibilityService = $this->createMock(ParticipantEligibilityChecker::class);
+        $this->participantEligibilityService = $this->createStub(ParticipantEligibilityChecker::class);
         $this->participantEligibilityService
             ->method('isParticipantEligible')
             ->willReturnCallback(fn (): bool => $this->participantEligible);