v5.1.0

This version bumps the following dependency versions:

• Scala to 2.13.12 and 3.3.1
• ZIO to 2.0.21
• Doobie to 1.0.0-RC5 (thank you @strokyl)

It also contains a small improvement on error handling: when the transaction fails AND the rollback (or the commit if commit-on-failure was used) fails, the resulting error cause will now contain both failures: the initial failure, and the rollback failure.