Legacy _cron() tasks have been deprecated

[luisdev]

See:

moodle-mod_simplecertificate/lib.php

Line 250 in c65cd5e

function simplecertificate_cron() {

The above code still uses the _cron() function that was deprecated in Moodle 3.7. This code should be rewritten to implement a local task.

See https://tracker.moodle.org/browse/MDL-65051