Bump pngjs from 6.0.0 to 7.0.0

Bumps [pngjs](https://github.com/pngjs/pngjs) from 6.0.0 to 7.0.0.
- [Changelog](https://github.com/pngjs/pngjs/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pngjs/pngjs/commits)

---
updated-dependencies:
- dependency-name: pngjs
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -118,7 +118,7 @@
     "mock-socket": "^9.0.3",
     "nightwatch": "^2.3.0",
     "open": "^8.4.0",
-    "pngjs": "^6.0.0",
+    "pngjs": "^7.0.0",
     "pre-commit": "^1.2.2",
     "process": "^0.11.10",
     "request": "^2.88.0",