chore(deps-dev): bump metalsmith-pdfize from 3.0.0 to 4.0.0

Bumps [metalsmith-pdfize](https://github.com/dpobel/metalsmith-pdfize) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/dpobel/metalsmith-pdfize/releases)
- [Commits](dpobel/metalsmith-pdfize@v3.0.0...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>