sage

1e6119e8 -

gh-36114: using `# needs` in posets folder using the `needs` directive in `posets` folder ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. URL: https://github.com/sagemath/sage/pull/36114 Reported by: Frédéric Chapoton Reviewer(s): Matthias Köppe