Bump pngjs from 6.0.0 to 7.0.0

Bumps pngjs from 6.0.0 to 7.0.0.

Changelog

Sourced from pngjs's changelog.

7.0.0 - 19/02/2023

• BREAKING - Drop support for node 12 (Though nothing incompatible in this release yet)
• Switch to a pngjs organisation

Commits

• See full diff in compare view

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