fix(backend): update league/commonmark to latest version released

Author: Shadow243

composer.json

@@ -48,7 +48,7 @@
         "ezyang/htmlpurifier": "^4.17",
         "garethp/php-ews": "dev-master",
         "henrique-borba/php-sieve-manager": "^1.0",
-        "league/commonmark": "^2.4",
+        "league/commonmark": "^2.7",
         "paragonie/random_compat": "^2.0.18",
         "php": ">=8.1",
         "react/async": "^4.3.0",