ISPConfig 3.3.1b1 installer still uses the backtick operator (`) instead of shell_exec

Hey guys, upon running the updater, I get the following warning: PHP Deprecated: The backtick (`) operator is deprecated, use shell_exec() instead in /tmp/ispconfig3_install/install/lib/installer_base.lib.php on line 1074 Operating System: Debian 13.0 (Trixie) or compatible

Line 1074 shows: $postfix_version = postconf -d mail_version 2>/dev/null;

While it should be $postfix_version = shell_exec("postconf -d mail_version 2>/dev/null");

You may want to fix it before the final release.

Thank you for your hard work.

t0r