Updated Jujutsu to 0.39.0 for #guix. In this PR, or anyone that wants to try it:
https://codeberg.org/guix/guix/pulls/7078
Nice features are a new `jj arrange` which is kinda `git interactive rebase` but without the fear.
And, `jj bookmark advance` which makes it easy to move a bookmark (branch) forward. Improves interacting with Git branches.
