Remove symfony/polyfill-php84 dependency

Author: brendt

composer.json

@@ -20,7 +20,6 @@
         "ibexa/core": "^5.0",
         "ibexa/content-forms": "^5.0",
         "symfony/mailer": "^7.3",
-        "symfony/polyfill-php84": "^1.33",
         "netgen/ibexa-forms-bundle": "^5.0",
         "netgen/ibexa-site-api": "^7.0",
         "netgen/ibexa-search-extra": "^4.0",