This is the second bugfix release of the 3.9.x series.

This release contains several bug-fixes and adjustments:

• Be more resilient to I/O failures when writing font cache
• Fix nondeterministic behavior with subplot spacing and constrained layout
• Fix sticky edge tolerance relative to data range
• Improve formatting of image values in cases of singular norms

Windows wheels now bundle the MSVC runtime DLL statically to avoid inconsistencies with other wheels and random crashes depending on import order.