build(deps): bump nltk from 3.8.1 to 3.9

Bumps [nltk](https://github.com/nltk/nltk) from 3.8.1 to 3.9.
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](nltk/nltk@3.8.1...3.9)

---
updated-dependencies:
- dependency-name: nltk
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -28,7 +28,7 @@ torch = ">=2.0.0, !=2.0.1, !=2.1.0"
 matplotlib = "^3.8.3"
 # https://discuss.ray.io/t/pandas-importerror-with-ray-data-dataset-show/13486
 pandas = "2.1.4"
-nltk = "3.8.1"
+nltk = "3.9"
 markdown = "*"
 IPython = "*"
 evaluate = "^0.4.0"