libertinus: 6.6 -> 6.8
libertinus: 6.6 -> 6.8

Notes:

https://github.com/libertinus-fonts/libertinus/releases/tag/v6.8
https://github.com/libertinus-fonts/libertinus/releases/tag/v6.7

* update repo "owner", moved
* don't try to build since we don't mean to :)
* update for font cleanup PR (thanks!)

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