added flake8_polyfill

.github/workflows/lint.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8==3.9.2 pytest==6.2.4 pytest-cov==2.12.1 typer==0.3.2 pytest-mock==3.6.1 pydantic==1.8.2 rich==10.6.0 openai==0.27.0 pylint==2.9.6 black==21.7b0 bandit==1.7.0 flake8-unused-arguments==0.0.6 radon==4.5.0
+          pip install flake8==3.9.2 pytest==6.2.4 pytest-cov==2.12.1 pylint==2.9.6 black==21.7b0 bandit==1.7.0 radon==4.5.0 flake8_polyfill==1.0.2
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names