Modify Captcha v3 threshold in config

[kibkib]

As I often get 'score-threshold-not-met' captcha error for my form, it would be nice to have an option to modify the threshold in the form config

There is a fixed value of 0.5 in the form.php

...
// Add version 3 specific options
if ($captcha_version == 3) {
$token = $form->value('token');
$resp = $recaptcha
->setExpectedHostname($hostname)
->setExpectedAction($action)
->setScoreThreshold(0.5)
->verify($token, $ip);
} else {