[jdk24u] RFR: 8348598: Update Libpng to 1.6.47

Wed Mar 19 16:42:41 UTC 2025

Hi all,

This pull request contains a backport of commit [6b82b42a](https://github.com/openjdk/jdk/commit/6b82b42a2116900b2125e03c1ffa0824d6062757) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Harshitha Onkar on 17 Mar 2025 and was reviewed by Alexander Zvegintsev, Phil Race and Erik Joelsson.

Thanks!

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Commit messages:
 - Backport 6b82b42a2116900b2125e03c1ffa0824d6062757

Changes: https://git.openjdk.org/jdk24u/pull/149/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=149&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348598
  Stats: 4890 lines in 20 files changed: 1906 ins; 2195 del; 789 mod
  Patch: https://git.openjdk.org/jdk24u/pull/149.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/149/head:pull/149

PR: https://git.openjdk.org/jdk24u/pull/149