[jdk25u-dev] RFR: 8377526: Update Libpng to 1.6.55

[Goetz Lindenmaier]

On Thu, 26 Feb 2026 17:37:37 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [fd74232d](https://github.com/openjdk/jdk/commit/fd74232d5dc4c6bfbcddb82e1b2621289aa2f65a) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Jayathirth D V on 26 Feb 2026 and was reviewed by Alexander Zvegintsev, Phil Race and Sergey Bylokhov.
> 
> Thanks!

I ran this through SAPs nightly testing ... all green.

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PR Comment: https://git.openjdk.org/jdk25u-dev/pull/320#issuecomment-3976586310