textproc/py-ocrmypdf: Update to 16.11.1

Backport a workaround for JPEG encoding issues with Ghostscript 10.6.0.

There's already release 16.12.0, but it requires py-pikepdf 10.0.1 as a
minimum which isn't present in the ports tree, yet.

Changelog:

https://github.com/ocrmypdf/OCRmyPDF/blob/v16.11.1/docs/release_notes.md

MFH: 2025Q4
(cherry picked from commit 103146dda2acf8f8d0882baedccfd0124b5be6e1)