chore(deps): update dependency nltk to v3.9.1

Author: renovate[bot]

assets/INPUT_FOLDER/requirements.txt

@@ -4,7 +4,7 @@ scipy == 1.5.3
 openpyxl ==3.0.9
 pillow == 8.0.0
 seaborn == 0.11.1
-nltk == 3.6.2
+nltk ==3.9.1
 networkx == 2.5
 spacy == 3.0.6
 matplotlib == 3.3.4