Latest Glamour has slightly changed logic in line length / wrapping,
resulting test failures due to string mismatch. Update tests and bump
dependency to v0.8.0, and others to the bare minimal level as generated
by `go mod tidy`.
This was detected then building the GitHub cli package `gh` in Debian
started to fail with src:golang-github-charmbracelet-glamour 0.8.0-1.
Closes: #10179
This changes the FetchRelease implementation to look up draft releases directly using by its pending tag name, as opposed to resorting to the Releases list API which is backed by Elastic Search and thus suffers replication lag after the creation of a draft release.
Bonus: all release lookup functions now accept a context for cancellation.
