Case C-651/21, M. Ya. M. (Co-heir’s waiver of succession): Judgment of the Court (Tenth Chamber) of 30 March 2023 (request for a preliminary ruling from the Sofiyski rayonen sad — Bulgaria) — Proceedings brought by M. Ya. M. (Reference for a preliminary ruling — Judicial cooperation in civil matters — Measures relating to the law on succession — Regulation (EU) No 650/2012 — Article 13 — Declaration concerning the waiver of a succession made by an heir before the court of the Member State of his or her habitual residence — Subsequent registration of that declaration, at the request of another heir, in the register of another Member State)