Update python-app.yml

Author: toddbirchard

.github/workflows/python-app.yml

@@ -22,9 +22,7 @@ jobs:
         python-version: 3.9
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
-        pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+       make install
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names