feat: add sf_event_mgt as dev dependency

Author: maikschneider

composer.json

@@ -21,7 +21,8 @@
     "bk2k/bootstrap-package": "dev-master",
     "friendsofphp/php-cs-fixer": "^3.12",
     "saschaegerer/phpstan-typo3": "^1.9",
-    "helhum/typo3-console": "^8.0"
+    "helhum/typo3-console": "^8.0",
+    "derhansen/sf_event_mgt": "dev-develop"
   },
   "extra": {
     "typo3/cms": {