chore(deps): bump libpng from 0024abd to 171bdd3

Bumps [libpng](https://github.com/pnggroup/libpng) from `0024abd` to `171bdd3`.
- [Commits](pnggroup/libpng@0024abd...171bdd3)

---
updated-dependencies:
- dependency-name: libpng
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>