Bump nltk from 3.9.3 to 3.9.4 in /sdks/python/container/ml/py312 (#38227)

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:production
...

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Author: dependabot[bot]

sdks/python/container/ml/py312/gpu_image_requirements.txt

@@ -167,7 +167,7 @@ multidict==6.7.1
 namex==0.1.0
 networkx==3.6.1
 ninja==1.13.0
-nltk==3.9.3
+nltk==3.9.4
 numba==0.61.2
 numpy==2.2.6
 nvidia-cublas-cu12==12.6.4.1