matplotlib/matplotlib: REL: v3.5.3

This is the third bugfix release of the 3.5.x series. This release contains several bug-fixes and adjustments: Fix alignment of over/under symbols Fix bugs in colorbars: alpha of extensions drawedges=True with extensions handling of panchor=False Fix builds on Cygwin and IBM i Fix contour labels in SubFigures Fix cursor output: for imshow with all negative values when using BoundaryNorm Fix interactivity in IPython/Jupyter Fix NaN handling in errorbar Fix NumPy conversion from AstroPy unit arrays Fix positional markerfmt passed to stem Fix unpickling: crash loading in a separate process incorrect DPI when HiDPI screens