chore(deps): bump pypdf in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [pypdf](https://github.com/py-pdf/pypdf).


Updates `pypdf` from 6.1.3 to 6.4.0
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@6.1.3...6.4.0)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.4.0
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

requirements.txt

@@ -173,7 +173,7 @@ pydeck==0.9.1
 Pygments==2.19.1
 pylatexenc==2.10
 pyparsing==3.2.3
-pypdf==6.1.3
+pypdf==6.4.0
 pypdfium2==4.30.0
 pytest==8.4.2
 python-bidi==0.6.6