Update python-app.yml

Updated workflow to change python version and print installed dependencies

.github/workflows/python-app.yml

@@ -19,15 +19,18 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.10
+    - name: Set up Python 3.8
       uses: actions/setup-python@v3
       with:
-        python-version: "3.10"
+        python-version: "3.8"
     - 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
+    - name: List installed packages
+      run: |
+        pip freeze
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names