Thank you for raising this issue, and the queue has become unstuck and thus usable again.
The stable snaps weren’t “released” though, so I went into the Snap Dashboard interface and released Hugo 0.28 into the stable channel.
For everyone following this, if your Hugo snap hasn’t been automatically updated yet, a manual run of
$ snap refresh
should do the trick.
Special thanks to the Canonical team for the quick resolve of the issue!