Backport "Improve, document and group versioning code in `Build.scala` " to 3.6.2#21893

WojciechMazur wants to merge 1 commit intorelease-3.6.2scala/scala3:release-3.6.2from

release-3.6.2-backport-21837scala/scala3:release-3.6.2-backport-21837Copy head branch name to clipboard