upgrade hugo to try to fix build

I was able to reproduce the problem with an older hugo (the one
specified by status.tpo) locally, and fix it with this image, which is
the same version as the one shipped in Debian bullseye.

.gitlab-ci.yml

+image: registry.gitlab.com/pages/hugo/hugo_extended:0.80.0
+
 include:
   project: tpo/tpa/status-site
   file: .gitlab-ci.yml