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