Case T-384/21: Judgment of the General Court of 20 December 2023 — Confédération nationale du Crédit mutuel and Others v SRB (Economic and monetary union — Banking union — Single resolution mechanism for credit institutions and certain investment firms (SRM) — Single Resolution Fund (SRF) — Decision of the SRB on the calculation of the 2021 ex-ante contributions — Duty to state reasons — Principle of good administration — Principle of effective judicial protection — Plea of illegality — Limitation of the temporal effects of the judgment)