devel/jujutsu: update to version 0.34.0

The update from version 0.32.0 to 0.34.0 contains a large number of
changes. (0.33.0 has been skipped on FreeBSD due to build issues.)

For the complete list of changes see:

https://github.com/jj-vcs/jj/releases/tag/v0.33.0
https://github.com/jj-vcs/jj/releases/tag/v0.34.0