Case C-659/22, Ministerstvo zdravotnictví (Covid-19 mobile application): Judgment of the Court (Eighth Chamber) of 5 October 2023 (request for a preliminary ruling from the Nejvyšší správní soud — Czech Republic) — RK v Ministerstvo zdravotnictví (Reference for a preliminary ruling — Protection of natural persons with regard to the processing of personal data — Regulation (EU) 2016/679 — Article 4(2) — Concept of ‘processing’ of personal data — Mobile application — Verification of the validity of ‘EU Digital COVID Certificates’ issued pursuant to Regulation (EU) 2021/953)