fix issues with gh actions test workflow

Author: pseewald

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python: ["3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout code
@@ -24,18 +24,22 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
+          cache: pip
 
       - name: Install project & dependencies
         run: pip install .[dev]
 
       - name: Run unit and short integration tests
         run: |
-          coverage run --source=fprettify run_tests.py -s unittests -s builtin -s regular
+          coverage run -p --source=fprettify run_tests.py -s unittests -s builtin -s regular
 
       - name: Run long integration tests
         if: ${{ github.event_name == 'schedule' }}
         run: |
-          coverage run --source=fprettify run_tests.py -s cron
+          coverage run -p --source=fprettify run_tests.py -s cron
+
+      - name: Combine coverage files
+        run: coverage combine
 
       - name: Coverage upload
         run: coveralls --service=github