Update gitlab-pages to latest version

What does this MR do and why?

This MR updates gitlab-pages to the latest version to include changes from Update Golang to 1.21.4 (gitlab-pages!928 - merged) that reduce the number of Golang versions we install in GDK.

Reference: gitlab-pages@88505552...6cb3173f

Changelog: changed

Related to gitlab-development-kit#1996 (closed)

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.