Add support for auto JVM update

[anthonydahanne]

Describe the Enhancement

It's kind of tedious updating the descriptor and buildpack.toml for each JDK/JRE buildpack when for example we switch from 19 to 20.

octo knows how to upgrade a JVM when it's already there; but it does not know

• when new stable JVM is out
• when that new JVM is out,
  • if it's a new LTS, we add it and remove the previous non LTS
  • if its new non LTS, we replace the previous non LTS with it

Possible Solution

Update octo so that it automatically deals with new JVM releases

Motivation

impact is less tedious work