Stable release, both available on Drupal 8 and 9.
Warning:
By going stable, we stabilized the way this module handles the libraries.
Depending on how you actually installed it the first time, you might have to go throught the installation documentation again to check every pre-requisites.
Update to this version might break your masonry installation until you make sure you properly download the masonry and imagesloaded dependencies as per expectations, either by hand or via composer (see instructions).