ci: Update for changes in CI template

Arun Raghavan requested to merge arun/pulseaudio:fix-gitlab-ci into master

This updates things based on changes in the templates that we use. Also pins the ref in the template repo so that our build does not break when the template parameters change.

This does mean that we should likely periodically check the ci-templates repo, but this seems to be better than the build breaking unexpectedly.

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