chore: Bump image to v0.25, without the dxt feature

[torokati44]

I hope some visual tests will fail on this, at least on Windows.
To be fixed by an alternative implementation based on https://github.com/jansol/texpresso, as recommended.

[torokati44]

Uuuuhm. Huhh. How does this still work, @Aaron1011 ? 🤔
Do we simply not have a visual test for DXT-compressed textures?
I have no idea how ATF actually works together with the different algorithms... :/

[Aaron1011]

I added the dxt feature early on when working on compressed alpha support, but we don't actually use it - we produce a TIFF image from the jpegxr crate, and then decode that using the image crate.

[torokati44]

Oooh, I see. Thanks for the explanation!
So we're actually always taking the "compatibility fallback" option out of the ATF, and pre-decompress it on the CPU for the sake of portability, instead of making use of the other GPU-friendly compressed alternatives in there?