feat: replace xss extension with symfony component

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -237,7 +237,7 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
                 'maxlength' => 20,
             ],
             'help' => 'Bitte gib das Kennzeichen deines Fahrzeugs an. Du kannst es aber auch später nachreichen.',
-            'clean_xss' => true,
+            'sanitize_html' => true,
         ];
 
         // Skipass field provider - provides age-appropriate skipass options from travel data filtered by date range
@@ -277,7 +277,7 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
         $this->fieldOptionProviders['remarksRoom'] = fn (BookingDtoInterface $bookingDto, int $participantIndex, array $options = []) => [
             'label' => 'Wünsche oder Anmerkungen zum Zimmer',
             'required' => false,
-            'clean_xss' => true,
+            'sanitize_html' => true,
             'attr' => [
                 'rows' => 2,
             ],