flatpak: Temporarily use WIP branch of gnome-autoar

This is not indended to be merged, it is just for testing purposes.
The gnome-autoar dependency needs to be bumped after gnome-autoar!22
merge instead...
2 jobs for wip/oholy/encrypted-archives in 5 minutes and 19 seconds
Status Job ID Name Coverage
  Test
passed #1357012
flatpak
flatpak devel

00:05:19

passed #1357013
style check

00:00:49