fix: replace imghdr (removed from Python 3.13) by puremagic

[thebaptiste]

imghdr is deprecated since Python 3.11 and removed from Python 3.13 (see pep-0594) You should use puremagic instead

[thebaptiste]

Another possibility would be to add standard-imghdr in requirements, but I think it's better to remove this deprecated call...

[Brightcells]

@thebaptiste Thanks. I'll release a new version tomorrow.

[thebaptiste]

@Brightcells Don't forget to release

[Brightcells]

@Brightcells Don't forget to release

Apologise for the late response. Version 3.0.2 has released

[thebaptiste]

Thanks

[thebaptiste]

It's a good idea to have the same release number for the pngquant library and for the python module !