chore(deps-dev): bump pixelmatch from 4.0.2 to 5.2.1 (#7704)

Bumps [pixelmatch](https://github.com/mapbox/pixelmatch) from 4.0.2 to 5.2.1.
- [Release notes](https://github.com/mapbox/pixelmatch/releases)
- [Commits](https://github.com/mapbox/pixelmatch/compare/v4.0.2...v5.2.1)

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

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package.json

@@ -104,7 +104,7 @@
     "minimist": "1.2.0",
     "mocha": "9.1.3",
     "ncp": "2.0.0",
-    "pixelmatch": "4.0.2",
+    "pixelmatch": "5.2.1",
     "pngjs": "6.0.0",
     "prettier": "2.3.0",
     "sinon": "9.2.4",