Bump nltk from 3.8.1 to 3.9 in /patchscopes/code

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] <support@github.com>

patchscopes/code/requirements.txt

@@ -5,7 +5,7 @@ numpy==1.25.2
 datasets==2.14.7
 zstandard==0.22.0
 transformers==4.34.1
-nltk==3.8.1
+nltk==3.9
 rouge_score==0.1.2
 sentencepiece==0.1.99
 huggingface_hub==0.17.3