Updated libpng to 1.6.44 #8820

Job	Run time
macos-14 Python pypy3.10	5m 16s
macos-14 Python 3.13	2m 27s
macos-14 Python 3.12	2m 5s
macos-14 Python 3.11	2m 17s
macos-14 Python 3.10	2m 54s
ubuntu-latest Python pypy3.10	7m 24s
ubuntu-latest Python 3.13	3m 48s
ubuntu-latest Python 3.12	4m 11s
ubuntu-latest Python 3.11	4m 3s
ubuntu-latest Python 3.10	4m 13s
ubuntu-latest Python 3.9	4m 9s
ubuntu-latest Python 3.13-dev free-threaded	4m 31s
macos-13 Python 3.9	6m 48s
Test Successful	1s
	54m 7s

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