update-license-data: fix latest_tag error

[SeekingMeaning]

Add latest_tag method to utils/spdx

Related: #8215, #8284

cc @issyl0

[reitermarkus]

Might be better to just return this from download_latest_license_data!.

[Rylan12]

Might be better to just return this from download_latest_license_data!.

I did this in #8260 but I think I like this better. It seems a little arbitrary to have download_latest_license_data! return the tag name.

This way, it's clear what's going on.

[reitermarkus]

It seems a little arbitrary

I don't think it's arbitrary. You download the latest something and as a result you get to know the specific version.

[Rylan12]

You download the latest something and as a result you get to know the specific version.

I think what bothers me is that the download_latest_license_data! method does more than just return the latest tag. It feels like if it should return anything, it should be whether or not it succeeded.

But no strong feelings about it either way.

[MikeMcQuaid]

Merging as-is as this is a fix. Happy to have another PR refactoring. Thanks @SeekingMeaning!