build(deps): bump pypdf in /langgraph_agent_with_genai/src

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 5.5.0 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@5.5.0...6.4.0)

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

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

Author: dependabot[bot]

langgraph_agent_with_genai/src/requirements.txt

@@ -3,7 +3,7 @@ oci==2.159.1
 python-docx==1.1
 pdf2image==1.17.0
 numpy==2.2.6
-pypdf==5.5.0
+pypdf==6.4.0
 opencv-python==4.12.0.88
 tzlocal==5.3.1
 PyMuPDF==1.26.0