Update python-package.yml

.github/workflows/python-package.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.9"]
 
     steps:
     - uses: actions/checkout@v4
@@ -29,6 +29,9 @@ jobs:
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Install Ghostscript...
+      run: |
+        apt install ghostscript -y
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names