Update Hugo version for Docs test
What does this MR do?
Updates the Hugo build image for the docs site.
Why was this MR needed?
Upgrading Hugo for the docs site. We should test the docs in the same version that the production website uses.
What's the best way to test this MR?
- View successful pipeline job: https://gitlab.com/gitlab-org/gitlab-runner/-/jobs/11516729024
What are the relevant issue numbers?
Edited by Sarah German