ContourPy Windows wheels uploaded to PyPI should statically link the C++ runtime following the same approach as in matplotlib/matplotlib#28687 to avoid problems (crashes) mixing versions of C++ runtimes. Original Matplotlib issue is matplotlib/matplotlib#28551.

Also need to test ContourPy nightly wheels against released and nightly wheels of dependent projects, notably NumPy and Matplotlib, in CI. This only needs to occur whenever new nightly wheels are uploaded.