Joined Cases C-40/20 and C-173/20: Judgment of the Court (Sixth Chamber) of 15 December 2022 (requests for a preliminary ruling from the Consiglio di Stato — Italy) — AQ, BO and CP (C-40/20), as well as AZ, BY, CX, DW, EV, FU and GJ (C-173/20) v Presidenza del Consiglio dei Ministri, Ministero dell’Istruzione, dell’Università e della Ricerca — MIUR, and Università degli studi di Perugia (References for a preliminary ruling — Social policy — Fixed-term work — Directive 1999/70/EC — Framework agreement — Principle of non-discrimination — Measures to prevent abuse of successive fixed-term employment contracts — Public-law fixed-term employment relationship — University researchers)