desktop: add <release> tags for 2.8.x.
Did a bit of archeology to get all the dates back. I didn't add any description. Not sure if we should bother that much for older versions (but most probably for upcoming version, would be useful). I also wanted to add URLs to the various news for each release, but appstream-util would fail, telling that hyperlinks are not allowed inside <p>. Unfortunately <release> tag cannot have a <url> child (nor a property) according to appstream docs. So for now, I'll just stick to date listing. (cherry picked from commit 3595ef9d)
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