Case C-560/21, KISA: Judgment of the Court (Sixth Chamber) of 9 February 2023 (request for a preliminary ruling from the Bundesarbeitsgericht — Germany) — ZS v Zweckverband ‘Kommunale Informationsverarbeitung Sachsen’ KISA, Körperschaft des öffentlichen Rechts (Reference for a preliminary ruling — Protection of natural persons with regard to the processing of personal data — Regulation (EU) 2016/679 — Article 38(3) — Data protection officer — Prohibition on dismissing data protection officer for performing his or her tasks — Requirement for functional independence — National legislation prohibiting the dismissal of a data protection officer without just cause)