Bump nltk from 3.9.1 to 3.9.3 in /packages/graphrag

Bumps [nltk](https://github.com/nltk/nltk) from 3.9.1 to 3.9.3.
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](nltk/nltk@3.9.1...3.9.3)

---
updated-dependencies:
- dependency-name: nltk
  dependency-version: 3.9.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/graphrag/pyproject.toml

@@ -46,7 +46,7 @@ dependencies = [
     "graspologic-native~=1.2",
     "json-repair~=0.30",
     "networkx~=3.4",
-    "nltk==3.9.1",
+    "nltk==3.9.3",
     "numpy~=2.1",
     "pandas~=2.3",
     "pyarrow~=22.0",