gh 2.1.0 (new formula) - GitHub CLI.

Closes #28829.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
gh: update 2.1.0 bottle.

Closes #28829.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
zsh_completion: fix brew config.

Signed-off-by: Xu Cheng <xucheng@me.com>

Closes #28878.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>