An act to amend Sections 20155, 20155.1, 20155.3, 20155.4, 20155.5, 20155.6, 20155.7, and 20155.9 of, and to amend the heading of Article 3.7 (commencing with Section 20155) of Chapter 1 of Part 3 of Division 2 of, the Public Contract Code, relating to public contracts.