Update polymake to 4.5, change from experimental to optional #32605
Description
https://polymake.org/doku.php/news/release_4_5 (2021-09-29)
Previous update: 4.4 (#27745)
Depends on #31163
CC: @kliem @tscrim @sagetrac-tmonteil @simon-king-jena
Component: packages: optional
Author: Matthias Koeppe
Branch: 015b899
Reviewer: Travis Scrimshaw
Issue created by migration from https://trac.sagemath.org/ticket/32605