[jdk8u-dev] RFR: 8375063: Update Libpng to 1.6.54

[Paul Hohensee]

On Sun, 15 Feb 2026 21:24:56 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [a2e74957](https://github.com/openjdk/jdk/commit/a2e749572e03dd394d123b701e163e3837472dd0) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Jayathirth D V on 21 Jan 2026 and was reviewed by Sergey Bylokhov and Phil Race.
> 
> The backport is mostly clean, I had to update the license in `THIRD_PARTY_README` instead of `libpng.md`.
> No new issues found by the :jdk_desktop tests.

Marked as reviewed by phh (Reviewer).

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PR Review: https://git.openjdk.org/jdk8u-dev/pull/760#pullrequestreview-3809502056