[FEATURE] 3.13 Support

[AmmoniumX]

Is your feature request related to a problem? Please describe.
rembg is not installable on python>=3.13

Describe the solution you'd like
Adjust python_requires=">=3.8, <3.13" to include python 3.13 if there is no good reason to limit it

Is there any reason why rembg has python_requires=">=3.8, <3.13" ? If not, please update it so that it can work with python 3.13