Update gitlab-dangerfiles to 2.3.1
What does this MR do and why?
See https://gitlab.com/gitlab-org/gitlab-dangerfiles/-/merge_requests/63 (and for context: !71128 (merged))
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR. - This is not "high-impact", because only a Danger rule gets updated.