Update from libavif 0.9.0 to 1.1.1

[kevinmershon]

For anyone trying to use this project and confused why it doesn't work, it is built for libavif 0.9.0. The pointer structures for avifEncoder and avifRGBImage (but also probably others) have bytes in the wrong order which will cause various steps of encoding to fail.

I was able to find a windows x64 libavif v0.9.0 build at https://windows.php.net/downloads/pecl/deps/ which was sufficient for a PoC, but Quality was added to the encoder settings in v1.0.0 so it's not quite good enough for my purposes.