Bump nltk from 3.9.1 to 3.9.4

Bumps [nltk](https://github.com/nltk/nltk) from 3.9.1 to 3.9.4.
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](nltk/nltk@3.9.1...3.9.4)

---
updated-dependencies:
- dependency-name: nltk
  dependency-version: 3.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements_dev.txt

@@ -4,7 +4,7 @@ flake8==7.3.0
 gensim==4.4.0
 isort==5.13.2
 mypy==1.19.1
-nltk==3.9.1
+nltk==3.9.4
 numpy==2.2.3
 pycln==2.6.0
 pylint==3.3.3