chore(deps): bump the security-updates group across 1 directory with 2 updates (#5088)

Bumps the security-updates group with 2 updates in the / directory: [nltk](https://github.com/nltk/nltk) and [pypdf](https://github.com/py-pdf/pypdf).


Updates `nltk` from 3.9.3 to 3.9.4
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](https://github.com/nltk/nltk/compare/3.9.3...3.9.4)

Updates `pypdf` from 6.9.1 to 6.9.2
- [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/6.9.1...6.9.2)

---
updated-dependencies:
- dependency-name: nltk
  dependency-version: 3.9.4
  dependency-type: indirect
  dependency-group: security-updates
- dependency-name: pypdf
  dependency-version: 6.9.2
  dependency-type: indirect
  dependency-group: security-updates
...

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