Specify parent version when downloading resources from git

[thepetk]

Which area is this bug related to?

/area library

Bug Summary

Not sure if it's actually a bug, I'm only adding the flag because it raised the issue #1628

TL;DR When flattening a parent devfile, we're currently downloading the default version's resources instead of the one mentioned inside the child devfile.

A detailed description of the issue can be found here #1628 (comment)

Expected behavior

We should be downloading the resources from the version mentioned inside the child devfile.

Acceptance Criteria

• We're now downloading the resources of the parent stack version mentioned inside the child devfile.
• The temporay fix here Revert "Use latest Java Spring Boot stack as default (#439)" registry#479 has been reverted.

[thepetk]

Adding blocker as tag, because it currently blocks us from setting as default versions that have additional resources (due to the console permission issue)