Update Drupal Canvas to RC1
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3551490. -->
Reported by: [phenaproxima](https://www.drupal.org/user/205645)
Related to !651
>>>
<p>We're using Canvas' beta. We should require RC1 and remove polyfills we no longer need.</p>
issue