Merge pull request #141 from firefly-cpp/dependabot/pip/nltk-3.9

Bump nltk from 3.8.1 to 3.9

Author: firefly-cpp

docs/requirements.txt

@@ -46,7 +46,7 @@ matplotlib==3.8.2
     # via niapy
 niapy==2.1.0
     # via -r requirements.in
-nltk==3.8.1
+nltk==3.9
     # via -r requirements.in
 numpy==1.26.4
     # via