chg: [flake8] Set max-line-length to 120.

.github/workflows/pythonapp.yml

@@ -39,7 +39,7 @@ jobs:
         # stop the build if there are Python syntax errors or undefined names
         poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        poetry run flake8 . --count --max-complexity=15 --max-line-length=100 --statistics
+        poetry run flake8 . --count --max-complexity=15 --max-line-length=120 --statistics
 
     # - name: Test with pytest
     #   run: |