fix: Consume chunk body in APNG push-mode discard paths
Merge tag 'v1.6.57' into branch 'libpng18' into develop
Merge tag 'v1.6.56' into branch 'libpng18' into develop
Merge tag 'v1.6.55' into branch 'libpng18' into develop
Merge tag 'v1.6.54' into branch 'libpng18' into develop
Merge tag 'v1.6.53' into branch 'libpng18' into develop
Merge tag 'v1.6.52' into branch 'libpng18' into develop
Merge tag 'v1.6.51' into branch 'libpng18' into develop