MFH: r521868

textproc/py-ocrmypdf: Update to 9.3.0

Changelog since 9.1.1:

In addition to some enhancements, a regression that existed since the 7.x
release, has also been fixed.

https://github.com/jbarlow83/OCRmyPDF/blob/v9.3.0/docs/release_notes.rst

Approved by: ports-secteam (joneum)