maxgalleria post editor warning: “media_buttons_context is deprecated”

When editing a post, in the Gutenberg editor, see the following above the Maxgalleria button:

> “Deprecated: media_buttons_context is deprecated since version 3.5.0! Use media_buttons instead. in …/wp/wp-includes/functions.php on line 5234”

Sure enough, Maxgalleria.php line 727 shows this deprecated string still in use:

		add_action('media_buttons_context', array($this, 'media_button'));

Changing to this will remove the warning:

		add_action('media_buttons', array($this, 'media_button'));

WP: 5.6.2
Maxgalleria: 6.2.1
Constants:
WP_DEBUG Enabled
WP_DEBUG_DISPLAY Enabled