Update to 4.2.0

[hfiguiere]

• Update runtime to GNOME 43
• Update lxml to latest due to FTBFS
• Update GraphicsMagick due to FTBFS
• Update libavif as DT requirement mismatch with reality (FTBFS)
• Cleanup some unused CMake options

Also

• Updated libgphoto2
• Added JPEGXL support
• Updated lensfun database

[flathubbot]

Started test build 12907

[flathubbot]

Started test build 12912

[flathubbot]

Build 12907 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/125336/org.darktable.Darktable.flatpakref

[flathubbot]

Build 12912 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/125341/org.darktable.Darktable.flatpakref

[flathubbot]

Started test build 12927

[flathubbot]

Build 12927 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/125356/org.darktable.Darktable.flatpakref