investigate pymupdf segfaults

[pmeier]

The upper pin in

ragna/ragna/core/_document.py

Line 226 in 71acf83

return [PackageRequirement("pymupdf<=1.24.10,>=1.23.6")]

exists, because I saw segfaults when running pytest on Python 3.11 and 3.12. I couldn't find anything on their issue tracker regarding this. We should come up with a minimal example that reproduces the issue and report it so we are not stuck on an outdated version for eternity. If an issue for the segfault already exists, we should add a code comment linking it.

[pmeier]

I can reproduce them in CI in #527.