Bump pymupdf from 1.21.1 to 1.26.4

Bumps [pymupdf](https://github.com/pymupdf/pymupdf) from 1.21.1 to 1.26.4.
- [Release notes](https://github.com/pymupdf/pymupdf/releases)
- [Changelog](https://github.com/pymupdf/PyMuPDF/blob/main/changes.txt)
- [Commits](pymupdf/PyMuPDF@1.21.1...1.26.4)

---
updated-dependencies:
- dependency-name: pymupdf
  dependency-version: 1.26.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -40,7 +40,7 @@ icalendar==5.0.12
 
 cryptography==44.0.2
 requests[security]==2.32.3
-pymupdf==1.21.1
+pymupdf==1.26.4
 
 prometheus-client==0.17.1
 sentry_sdk==2.25.0