bump nltk version (#290)

Author: NathanHB

pyproject.toml

@@ -66,7 +66,7 @@ dependencies = [
     # Extension of metrics
     "aenum==3.1.15",
     # Base metrics
-    "nltk==3.8.1",
+    "nltk==3.9.1",
     "scikit-learn",
     "spacy==3.7.2",
     "sacrebleu",