Case C-226/21: Order of the Court (Eighth Chamber) of 13 December 2021 (request for a preliminary ruling from the Juzgado de lo Contencioso-Administrativo No 1 de Toledo — Spain) — KQ v Servicio de Salud de Castilla-La Mancha (SESCAM) (Framework agreement on fixed-term work concluded by ETUC, UNICE and CEEP — Clause 4 — Principle of non-discrimination — Concept of ‘employment conditions’ — Exemption from providing on-call medical services on the grounds of age granted solely to permanent workers)