Case C-714/21 P: Judgment of the Court (Tenth Chamber) of 9 March 2023 — Francoise Grossetête v European Parliament (Appeal — Law governing the institutions — Rules governing the payment of expenses and allowances to Members of the European Parliament — Amendment of the additional voluntary pension scheme — Individual decision fixing additional voluntary pension rights — Plea of illegality — Competence of the Bureau of the Parliament — Rights acquired or in the process of being acquired — Proportionality — Equal treatment — Legal certainty)