jj: update to 0.13.0.

## [0.13.0] - 2024-01-03

### Breaking changes

* `jj git fetch` no longer imports new remote branches as local branches. Set
  `git.auto-local-branch = true` to restore the old behavior.

### New features

* Information about new and resolved conflicts is now printed by every command.

* `jj branch` has gained a new `rename` subcommand that allows changing a branch
  name atomically. `jj branch help rename` for details.

### Fixed bugs

* Command aliases can now be loaded from repository config relative to the
  current working directory.
  [#2414](https://github.com/martinvonz/jj/issues/2414)

(wiz)