Update ci-test.yml: add Hugo 0.80.0

Not related to the theme, but it's an annoying bug in Hugo that I want to add to the list somehow.

Author: Vimux

.github/workflows/ci-test.yml

@@ -40,6 +40,7 @@ jobs:
           - '0.59.1' # last major version without goldmark renderer
           - '0.60.1' # first major version with goldmark renderer
           - '0.76.5' # https://github.com/gohugoio/hugo/issues/7822
+          # - '0.80.0' # https://github.com/gohugoio/hugo/issues/8340
           - '0.86.1' # https://github.com/gohugoio/hugo/issues/9150
           - 'latest'
       fail-fast: true