On MacOS 13 libpng was installed as version for MacOS 13
cibuildwheels is using delocate 0.11 for Python >3.6 which checks for compatibility
Also, cibuildwheels configures MacOS 10.9 as detault version, so delocate errored out
Disabling the MacOS version configuration only made delocate pick MacOS 13 as the minimum requirement
The resulting build cannot be tested with cibuildwheels as it demands MacOS 10.9 compatibility
Solution is to disable MacOS version configuration for delocate and rename the resulting wheel, so it is recognized as MacOS 10.9 version.
Clean solution was to find a way to install libpng for MacOS 10.9 for the MacOS 13 builds.
… was sometimes on the current MacOS version