Case C-421/22, DOBELES AUTOBUSU PARKS and Others: Judgment of the Court (Fifth Chamber) of 21 December 2023 (request for a preliminary ruling from the Augstākā tiesa (Senāts) — Latvia) — ‘DOBELES AUTOBUSU PARKS’ SIA, ‘CATA’ AS, ‘VTU VALMIERA’ SIA, ‘JELGAVAS AUTOBUSU PARKS’ SIA, ‘Jēkabpils autobusu parks’ SIA v Iepirkumu uzraudzības birojs, ‘Autotransporta direkcija’ VSIA (Reference for a preliminary ruling — Transport — Public passenger transport services by rail and by road — Regulation (EC) No 1370/2007 — Article 1(1) — Article 2a(2) — Article 3(1) — Article 4(1) — Article 6(1) — Contract for the provision of public passenger transport services by bus — Procedure for awarding a public service contract — Open, transparent and non-discriminatory tendering procedure — Specifications — Amount of compensation granted by the competent national authority — Indexation limited in terms of time and categories of specific costs