Add python3-dev and libffi-dev to CI dependencies

These packages are required for building PyGObject and pycairo from source.

Author: adamkrellenstein

.github/workflows/pylint.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update -y
-        sudo apt-get install -y libgirepository1.0-dev libcairo2-dev pkg-config
+        sudo apt-get install -y libgirepository1.0-dev libcairo2-dev pkg-config python3-dev libffi-dev
         python -m pip install --upgrade pip
         pip install pylint
         pip install pylint-sarif-unofficial