graphics/gegl: update to 0.4.32 release

Changelog:
- core: Fixing of leaks and dead code removal in json op handling, branch hints in buffer tile handling.
- distance-transform:
- openexr: fix build with newer OpenEXR 3
- negative-darkroom: contrast boost and illuminant adjustment parameter, reworked emulsion dye model, UI improvements, more black and white paper presets.
- fill-path: 32bit float RGB and CMYK color processing, using ctx as renderer.

With hat:	desktop