build(deps): bump ocrmypdf from 17.3.0 to 17.4.0 in /pdf (#273)

Bumps [ocrmypdf](https://github.com/ocrmypdf/OCRmyPDF) from 17.3.0 to 17.4.0.
- [Release notes](https://github.com/ocrmypdf/OCRmyPDF/releases)
- [Commits](ocrmypdf/OCRmyPDF@v17.3.0...v17.4.0)

---
updated-dependencies:
- dependency-name: ocrmypdf
  dependency-version: 17.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pdf/requirements.txt

@@ -1 +1 @@
-ocrmypdf==17.3.0
+ocrmypdf==17.4.0