Bump pypdf from 5.1.0 to 5.2.0 (#72)

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 5.1.0 to 5.2.0.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@5.1.0...5.2.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,5 +1,5 @@
 langchain-couchbase==0.2.2
 streamlit==1.41.1
 langchain-community==0.3.13
-pypdf==5.1.0
+pypdf==5.2.0
 langchain-openai==0.2.14