Why was c3p0 used (its latest version was released in Dec 2019)? Those tests existed for a while and people were too lazy to replace c3p0 with something newer?

Why was c3p0 used (its latest version was released in Dec 2019)? Those tests existed for a while and people were too lazy to replace c3p0 with something newer? I guess that they spent all their time to use virtual threads in those tests and had no time left to look at c3p0.