EDIT: this should no longer be necessary, please ensure your pmbootstrap is up to date (latest git master) and if you did run the below command reset it with pmbootstrap config -r mirrors.systemd (after updating)
if you're trying to use pmbootstrap and run into an issue because the systemd staging repo can't be found, doing the following will prevent it from attempting to fetch the (now missing) repo
$ pmbootstrap config mirrors.systemd none
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