ci: fix missing Ruby dependency in "documentation" job

Hi,

I spotted the failure yesterday. You can see that this fixes the pipeline at [1]. Thanks!

Patrick

To: git@vger.kernel.org

--- b4-submit-tracking ---

This section is used internally by b4 prep for tracking purposes.

{ "series": { "revision": 1, "change-id": "20260901-b4-pks-ci-fix-documentation-job-e971e10fbc94", "prefixes": [], "presubject": "" } }

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