fix: excludes "milestone" releases in "latest" command

[log2]

Summary

Fixes: #1306

Other Information

[jthegedus]

This is a minor change that I don't think it will hurt anyone, however we want to encourage plugin authors to implement their own bin/latest-stable script which you can see is called 9 lines above this change. Docs: https://asdf-vm.com/plugins/create.html#bin-latest-stable

If @Stratus3D has no objections then happy to merge

[log2]

Thank you for the suggestion @jthegedus , in fact I already implemented latest-stable in other asdf plugins (such as kubectl's asdf plugin, see here, where a direct endpoint to get latest stable version is provided by kubectl's maintainers), so I can definitely contribute back to asdf gradle plugin, too, using similar techniques, plus filtering out of "milestone" releases. I will try that way (PR to asdf gradle) as well.

[log2]

I've added PR to asdf-gradle project, as promised, @jthegedus

[Stratus3D]

I'm fine with the changes here but the existence of this code bothers me the in the same way as the PR I was reviewing earlier - #1191 (comment)

[Stratus3D]

Thanks for the PR @log2 ! Sorry for the late review.