chore: fix phpstan errors

src/Form/Service/ParticipantVegFieldHandler.php

@@ -107,10 +107,10 @@ class ParticipantVegFieldHandler extends AbstractParticipantFieldHandler
      *
      * This method checks age constraints if they exist for the service.
      *
-     * @param mixed      $selectedService   The selected veg option to validate
-     * @param array      $availableServices Array of available veg options
-     * @param BookingDto $bookingDto        The booking DTO for context
-     * @param int        $participantIndex  The participant index for age evaluation
+     * @param mixed               $selectedService   The selected veg option to validate
+     * @param array<int, Service> $availableServices Array of available veg options
+     * @param BookingDto          $bookingDto        The booking DTO for context
+     * @param int                 $participantIndex  The participant index for age evaluation
      *
      * @return bool True if the option is valid for the participant, false otherwise
      */