Elementor Pro 3.21.1

* Tweak: Added compatibility for Elementor v2.1

* Fix: Global widget PHP notices
* Fix: Slides widget active slide lost focus when clicking Editor tabs
* Fix: Form select field send all selected values on multiple selection
* Fix: Validate time field only if it's not empty
* Fix: ConvertKit API not saving name field

* Fix: Theme Builder `author` archive condition ([#4593](Author Archive Template not working when Author condition is set to 'All' · Issue #4593 · pojome/elementor))
* Fix: Respect password protected posts in Post Content widget
* Fix: Custom Fonts redirect to post edit screen in edge cases.