Log Message:
Update gh (Github CLI) to 1.4.0.

New Features
- View issue and pull request comment threads
- Manage GitHub Actions secrets
- Set up git credentials when logging into GitHub CLI

Fixes
- pr merge: attempt the merge even if mergeability status could not be
  determined
- repo clone: enable cloning repository wikis
- Recognize Include directives when parsing ssh config files
- Display the new release notice only once per 24 hours