matplotlib/matplotlib: REL: v3.4.2

This is the second bugfix release of the 3.4.x series. This release contains several critical bug-fixes: Generate wheels usable on older PyPy7.3.{0,1} Fix compatibility with Python 3.10 Add subplot_mosaic Axes in the order the user gave them to us Correctly handle 'none' facecolors in do_3d_projection Ensure that Matplotlib is importable even if there's no HOME Fix CenteredNorm with halfrange Fix bar_label for bars with NaN values Fix clip paths when zoomed such that they are outside the figure Fix creation of RangeSlider with valinit Fix handling of "d" glyph in backend_ps, fixing EPS output Fix handling of datetime coordinates in pcolormesh with Pandas Fix processing of some errorbar arguments Fix removal of shared polar Axes Fix resetting grid visibility Fix subfigure indexing error and tight bbox Fix textbox cursor color Fix TkAgg event loop error on window close Ignore errors for sip with no setapi (Qt4Agg import errors)