matplotlib/matplotlib: REL: v3.5.1

This is the first bugfix release of the 3.5.x series. This release contains several critical bug-fixes: fix installation issues when setting a default backend fix add_lines on horizontal colorbars fix streamplot with start points on right or top edge fix colorbars with boundaries or NoNorm fix colorbars with negative contours fix colorbars with tight layout fix setting Axis label alignment to center fix subfigure tight bounding box fix subplot parameter window on macosx backend fix unit handling in Collections.set_offsets fix unyt integration in errorbar re-display date offset in ConciseDataFormatter after zoom reduce do_3d_projection deprecation warnings in external artists