Merge "Upgrade libpng to v1.6.43" into main am: f81d8a61d8

Original change: https://android-review.googlesource.com/c/platform/external/libpng/+/3132653

Change-Id: I97fd4f2ffdfa2e5094b04e975ef4ce0ae9974dc2
Signed-off-by: Automerger Merge Worker <[email protected]>