Require soft dependency

Author: LucaGallinari

composer.json

@@ -24,6 +24,7 @@
         "symfony/framework-bundle": "^5.4 || ^6.0",
         "symfony/http-foundation": "^5.4 || ^6.0",
         "symfony/http-kernel": "^5.4 || ^6.0",
+        "symfony/mime": "^5.4 || ^6.0",
         "symfony/options-resolver": "^5.4 || ^6.0",
         "symfony/routing": "^5.4 || ^6.0",
         "symfony/translation-contracts": "^2.0",