feat: upgrade phpunit to 12.5

tests/Service/AccommodationBookingPdfGeneratorTest.php

@@ -64,7 +64,7 @@ class AccommodationBookingPdfGeneratorTest extends TestCase
         $twig = new Environment(new FilesystemLoader(__DIR__.'/../../templates'));
         $twig->addExtension(new IntlExtension());
 
-        $calculator = $this->createMock(AccommodationBookingBreakdownCalculator::class);
+        $calculator = $this->createStub(AccommodationBookingBreakdownCalculator::class);
         $calculator->method('compute')->willReturn($breakdown);
 
         return new AccommodationBookingPdfGenerator($twig, $calculator, \dirname(__DIR__, 2));