Case C-270/22, Ministero dell’Istruzione and INPS: Judgment of the Court (First Chamber) of 30 November 2023 (request for a preliminary ruling from the Tribunale ordinario di Ravenna — Italy) — G.D., A.R., C.M. v Ministero dell’Istruzione, Istituto nazionale della previdenza sociale (INPS) (Reference for a preliminary ruling — Social policy — Directive 1999/70/EC — Framework agreement on fixed-term work concluded by ETUC, UNICE and CEEP — Clause 4 — Public sector — Teachers — Employment of fixed-term workers as career civil servants through recruitment based on qualifications — Determination of the period of service deemed accrued)