[requires.io] dependency update

Author: requires

tox.ini

@@ -130,7 +130,7 @@ deps =
     pep8-naming==0.11.1
     pycodestyle==2.7.0
     pydocstyle==6.0.0
-    pyflakes==2.3.0
+    pyflakes==2.3.1
 
 commands =
     flake8 {posargs:setup.py src/{env:PY_MODULE}}