Update Jj

Updating crate versions

1. Modify Cargo.toml to update both jj-lib and jj-cli to the required version. This will either be a published version like version = "0.37.0" or a branch name like git = "https://github.com/jj-vcs/jj.git", branch = "main".
2. Run cargo update, which will update Cargo.lock.
3. Use /cargo-dedupe to match other dependencies' versions.

Fixing breaking changes

It's likely that jj API changes will require modifications to gg code. Make any necessary modifications, maintaining gg's current behaviour. For examples of how to use modified jj APIs, consult the source code at https://github.com/jj-vcs/jj - the jj-cli code (cli/ directory) often makes use of jj-lib code (lib/ directory) in similar ways to gg.

Verifying the update

1. Run cargo check - there should be no warnings or errors.
2. Run cargo test - all tests should pass.
3. If API changes have affected message structs in src/messages, use cargo gen to regenerate Typescript types and then npm run check to verify them.