igemnace [1] filed a request to merge circleci-cli-bin [2] into circleci-cli [3]:
circleci-cli PKGBUILD was out of date for quite some time.
stefanc_diff submitted an updated PKGBUILD, but unfortunately uploaded it to its own circleci-cli-bin package instead of submitting an update to circleci-cli.
Now that circleci-cli is up-to-date, there is no reason for two packages to exist anymore.
[1] https://aur.archlinux.org/account/igemnace/ [2] https://aur.archlinux.org/pkgbase/circleci-cli-bin/ [3] https://aur.archlinux.org/pkgbase/circleci-cli/