chore(wren-ai-service): bump nltk in /wren-ai-service

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

---
updated-dependencies:
- dependency-name: nltk
  dependency-version: 3.9.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

wren-ai-service/poetry.lock

@@ -54,7 +54,7 @@ requests = "^2.32.4"
 extra-streamlit-components = "^0.1.71"
 deepeval = "^3.0.0"
 tomlkit = "^0.13.0"
-nltk = "^3.9.3"
+nltk = "^3.9.4"
 psycopg2 = "^2.9.10"
 
 [tool.poetry.group.eval.dependencies]