gh: update to 2.12.1

GitHub CLI 2.12.1

  * pr merge: fix merge queue API access for PAT consumers by
  * Use go-gh repository.ParseWithHost
  * Use go-gh for SSH hostname alias translation

GitHub CLI 2.12.0

  * pr merge: add merge queue support

    The merge queue feature is currently in beta and available to only some
    repositories, but if a base branch has merge queue enabled, gh pr merge
    will add any pull request targeting that branch to the associated merge
    queue instead of attempting to immediately merge it.

  * codespace edit: add ability to interactively choose a codespace
  * repo list: fix compatibility with GHES older than v3.3
  * repo edit: fix interactive mode compatibility with GHES older than v3.3
  * pr create: allow forking of repositories with "internal" visibility
  * auth logout: remove confirmation prompt
  * repo create: fix "git init" instructions for paths that have spaces
  * codespace create: update prebuild availability status display
  * Clean up progress indicator if codespace fails to start
  * Extract LiveshareSession interface

(bsiegert)