Merge "Upgrade libpng to v1.6.44" into main am: cb503c51e6

Original change: https://android-review.googlesource.com/c/platform/external/libpng/+/3269490

Change-Id: I0534fe03122a4712206a5e303ad92f404edfb113
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>