PHP 7.4: Array and string offset access syntax with curly braces is deprecated
https://wiki.php.net/rfc/deprecate_curly_braces_array_access
PHP Runtime Deprecation Notice: Array and string offset access syntax with curly braces is deprecated in /var/www/dp-wired.de/htdocs/public/typo3conf/ext/scriptmerger/Classes/ScriptmergerBase.php line 139