Case C-356/21: Judgment of the Court (Second Chamber) of 12 January 2023 (request for a preliminary ruling from the Sąd Rejonowy dla m.st. Warszawy w Warszawie — Poland) — J.K. v TP S.A. (Reference for a preliminary ruling — Equal treatment in employment and occupation — Directive 2000/78/EC — Article 3(1)(a) and (c) — Conditions for access to self-employment — Employment and working conditions — Prohibition of discrimination based on sexual orientation — Self-employed person working on the basis of a contract for specific work — Termination and non-renewal of contract — Freedom to choose a contracting party)