Update Zrythm entry in Users.md

Fixed broken link and updated outdated description.

docs/markdown/Users.md

@@ -151,7 +151,7 @@ format files
  - [X Test Suite](https://gitlab.freedesktop.org/xorg/test/xts), The X.org test suite
  - [zathura](https://github.com/pwmt/zathura), a highly customizable and functional document viewer based on the
 girara user interface library and several document libraries
- - [Zrythm](https://git.zrythm.org/cgit/zrythm), a cross-platform digital audio workstation using GTK+ 3
+ - [Zrythm](https://git.sr.ht/~alextee/zrythm), a cross-platform digital audio workstation written in C using GTK4
  - [ZStandard](https://github.com/facebook/zstd/commit/4dca56ed832c6a88108a2484a8f8ff63d8d76d91), a compression algorithm developed at Facebook (not used by default)
 
 Note that a more up-to-date list of GNOME projects that use Meson can