Load Ahem via url() rather than local() in css/css-fonts/font-face-range-order.html
Differential Revision: https://phabricator.services.mozilla.com/D249590
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1966668
gecko-commit: cd09c6a40ef274b8f5a97bd09be609e17fe3f36a
gecko-reviewers: layout-reviewers, emilio