Force Wordpress HTTP Requests to always verify SSL

functions.php

<?php
// Add this to your child's theme functions file
// Source: https://surniaulula.com/2018/apps/wordpress/fix-sslverifyfalse-for-plugin-theme-update-checks/

add_filter( 'https_ssl_verify', '__return_true', PHP_INT_MAX );
add_filter( 'http_request_args', 'http_request_force_ssl_verify', PHP_INT_MAX );
 
function http_request_force_ssl_verify( $args ) {
        $args['sslverify'] = true;
        return $args;
}