Remove poetry & update to jsmin 3

Author: Jethro Muller

.github/workflows/lint_python_files.yml

@@ -32,11 +32,8 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-${{ env.os_version }}-${{ env.pythonLocation }}-pip-
 
-    - name: Install Poetry
-      run: curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python -
-
     - name: Install dependencies
-      run: poetry install
+      run: pip install -r requirements.txt
 
     - name: Lint with flake8
       run: poetry run flake8 --count --show-source --statistics .