[jdk8u] RFR: 8372534: Update Libpng to 1.6.51

[Andrew John Hughes]

On Tue, 6 Jan 2026 03:08:57 GMT, Alexey Bakhtin <abakhtin at openjdk.org> wrote:

> Thank you for the backport. I'm not a reviewer, but it looks good to me. I do not see any regressions.

Thanks Alexey. I'll have to move this over to 8u-dev now as we are post-freeze, but still plan to include this in the January release in sync with the later JDK releases.

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PR Comment: https://git.openjdk.org/jdk8u/pull/83#issuecomment-3716561259