Upgrade to HikariCP 6.2.1

[oburgosm]

I known that spring boot minor versions try to avoid updates major version dependencies, but in case of hikaricp, I don't see any reason nor breaking changes that could break something. It's related with brettwooldridge/HikariCP#2127. HikariCP resolves several important bugs (See HikariCP changes). So I think it could be an exception and update hikaricp in spring boot 3.X

[philwebb]

It looks like we missed the major upgrades in 3.4. Sorry about that.

I don't think we want to change the version we use in 3.3 or 3.4. It feels too risky at this point. We will, however, make sure we upgrade to 6.2.1 for Spring Boot 3.5. We'll also do our best to ensure that users can self upgrade in earlier 3.x releases if they so wish to.