Log Message:
gdk-pixbuf2: update to 2.42.8

2.42.8 (stable)
===

- Clear the pixbuf's memory buffer to avoid returning uninitialized memory
- Turn GdkPixbufModule functions into typed callbacks
- tiff: Use non-deprecated C99 integer types
- gif: Check for overflow when compositing or clearing frames
- Change png/jpeg/tiff build options from boolean to feature
- jpeg: Do not rely on UB around setjmp/longjmp
- Build fixes
- Documentation fixes
- Translation updates