For -S 3.x input use latest release from 3.x versions

[lwronski]

For now, If someone pass -S 3.1 parameter to scala-cli, it throws error:

VL-D-0317:scala-cli lwronski$ scala-cli hello.sc -S 3.1
Unsupported Scala version: 3.1

My expectation is, that scala-cli use latest version from 3.1.

There are two ways to solve this problem:

• If someone pass 3.x, we use latest scala version for 3.x (I have already done it in this PR).
• we have to add entries to scala-versions-v1.json such as: { "3.0.2", "3.1.0", "3.2.x", ..., "3.x.x"}. Mechanism search the latest supported version for prefix "3.1", but it doesn't exists in scala-versions-v1.json, therefore the error was throw.

Is the first option good enough?

[alexarchambault]

I would have done that slightly differently here: if some valid versions match the user input, only consider those. If no valid versions match, then look at all available Scala versions. Something like

Suggested change

	val validMatchingVersions =
	if (prefix.startsWith("3.") && prefix.length > 2) matchingVersions
	else
	matchingVersions
	.filter(v => validMaxVersions.exists(v <= _))
	val validMatchingVersions = {
	val filtered = matchingVersions.filter(v => validMaxVersions.exists(v <= _))
	if (filtered.isEmpty) matchingVersions
	else filtered
	}

[alexarchambault]

That would correspond to a "best effort" to use the valid versions, while still allowing non-valid ones when these can't work.

[lwronski]

Good point, your idea is much more universal.