Broken layout builder interface on the Florista Demo (compatibility with Gin theme)

Problem/Motivation

I noticed that the admin theme was broken when you work on the layout builder interface. Most notably double contextual menu icons and broken media library interfaces.

Steps to reproduce

- Install a new Drupal site starting from the Rocketship Florista Demo
- Manage the content blocks on a page with layout builder, try to add an image from the media library.
(See screenshots)

I didn't check in detail, but when I compared it with another recent demo env, it seems that Gin theme got an update and is now on a higher version.