What is your PHP version?
OJS 3.2 is recommend to run under PHP 7.2 (ojs/README.md at 3_2_1-1 · pkp/ojs · GitHub).
As you can see on PHP documentation, this function was deprecated on PHP 7.4 and removed on PHP 8 (https://www.php.net/manual/en/function.get-magic-quotes-runtime.php)
Best,
Israel