build(deps): bump png from 0.16.6 to 0.16.7
Bumps [png](https://github.com/image-rs/image-png) from 0.16.6 to 0.16.7. - [Release notes](https://github.com/image-rs/image-png/releases) - [Changelog](https://github.com/image-rs/image-png/blob/master/CHANGES.md) - [Commits](image-rs/image-png@v0.16.6...v0.16.7) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
