Bump pypdf from 4.1.0 to 4.3.1

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 4.1.0 to 4.3.1.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](https://github.com/py-pdf/pypdf/compare/4.1.0...4.3.1)

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

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

pyproject.toml

@@ -50,7 +50,7 @@ langchain-community = "0.0.29"
 langchain-experimental = "0.0.55"
 backoff = "2.2.1"
 toml = "*"
-pypdf = "4.3.0"
+pypdf = "4.3.1"
 ratelimit = "2.2.1"
 loguru = "0.7.2"
 pydantic = "2.8.2"