Fixes various warnings, wrong loggings and updates these dependancies (thanks to @ryonakano):
- elementary Flatpak platform (v6 -> v8)
- jpegoptim (v1.4.6 -> v1.5.5)
- optipng (v0.7.7 -> v0.7.8)
Fixes various warnings, wrong loggings and updates these dependancies (thanks to @ryonakano):