Bump pypdf from 6.1.1 to 6.1.3

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 6.1.1 to 6.1.3.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@6.1.1...6.1.3)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.1.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 langchain-couchbase==0.4.0
 streamlit==1.50.0
 langchain-community==0.3.31
-pypdf==6.1.1
+pypdf==6.1.3
 langchain-openai==0.3.35