Pillow 10.1 has changed the accepted type for gaussian_blur

[SvenBroeckling]

As of Pillow 10.1, Pillow uses a tuple for the GaussianBlur filter. Single int values are no longer accepted by the c function.

Sorl uses the prior single int call, but calls int(options["blur"]) before, which makes it impossible to give blur=(2, 2) as an option.

I'll create a pull request with changes to pil_engine.py and engines/base.py that supports Pillow >= 10.1