[ChangeLog][Third-Party Code] libpng was updated to version 1.6.47 Pick-to: 6.8 6.5 5.15 Change-Id: I11a0f266dddaad480a7700c3cdc4ec6da8de2fae Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io> (cherry picked from commit 8b75f4735b36a77b6426c7dab55190416e6a4af5) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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