[Android] Update libpng license

[Robert Stone]

vlc-android | branch: master | Robert Stone <rhstone at gmail.com> | Sun Jan  8 21:58:42 2023 -0800| [961e1b18d05db51420c980acf36e70b8fffd2ffd] | committer: Nicolas Pomepuy

Update libpng license

> https://code.videolan.org/videolan/vlc-android/commit/961e1b18d05db51420c980acf36e70b8fffd2ffd
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 application/vlc-android/res/raw/libraries.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/961e1b18d05db51420c980acf36e70b8fffd2ffd