Fix outdated pages brunch ci template

What does this MR do and why?

Fix outdated pages brunch ci template

Existing GitLab Pages Example Brunch: https://gitlab.com/pages/brunch/-/blob/master/.gitlab-ci.yml?ref_type=heads

Test project having this change with successful pipeline: https://gitlab.com/ngala/ngala-brunch

Related: #377585 (closed)

Changelog: fixed

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