REL: 3.7.1

This is the first bugfix release of the 3.7.x series.

This release contains several bug-fixes and adjustments:

* Ensure Qhull license is included in binary wheels
* Fix application of rcParams on Axes labels
* Fix compatibility with Pandas datetime unit converter
* Fix compatibility with latest GTK4
* Fix import of styles with relative path
* Fix Lasso unresponsiveness when clicking and immediately releasing
* Fix pickling of draggable legends
* Fix RangeSlider.set_val when new value is outside existing value
* Fix size of Tk spacers when changing display DPI
* Fix wrapped text in constrained layout
* Improve compatibility with third-party backends
* Improve error if animation save path does not exist