matplotlib/matplotlib: REL: v3.2.1

This is the first bugfix release of the 3.2.x series. This release contains several critical bug-fixes: fix Quiver.set_UVC calls with scalar inputs fix bezier.get_parallels failure from floating point rounding errors fix markers specified as tuples (polygons, stars, or asterisks) fix saving PNGs to file objects in some places fix saving figures using the nbAgg/notebook backend fix saving with tight layout using the PGF backend fix setting custom datapath in rcParams (note: it is still deprecated) fix various issues running setup.py in non-CI environments fix xpdf distiller various minor bug and documentation fixes