Describe the bug

$ gh repo sync alizter/dune
HTTP 404: Not Found (https://api.github.com/repos/alizter/dune/git/refs/heads/main)

when the repo doesn't need syncing, the command succeeds. Clicking this URL also correctly fetches the json.

NixOS

gh version 2.29.0 (1980-01-01)
https://github.com/cli/cli/releases/tag/v2.29.0

Steps to reproduce the behavior

1. Have a repo that needs syncing.
2. Do gh repo sync user/repo
3. Should 404

Expected vs actual behavior

It used to work and sync the repo.