macos CI: try not upgrading pip?

Author: brooksdavis

.github/workflows/python-app.yml

@@ -40,7 +40,8 @@ jobs:
                 run: |
                     # Use the system-provided python3 instead of actions/setup-python@v4
                     python3 --version
-                    python3 -m pip install --break-system-packages --upgrade pip
+		    # pip is already installed?
+                    # python3 -m pip install --break-system-packages --upgrade pip
                     python3 -m pip install --break-system-packages --upgrade pre-commit ruff==${{ env.RUFF_VERSION }}
                     python3 -m pip install --break-system-packages -r requirements.txt
             -   name: Lint with flake8