CI: trying a different way to activate the PDM venv

Author: Technologicat

.github/workflows/coverage.yml

@@ -33,7 +33,7 @@ jobs:
     - name: Generate coverage report
       run: |
         pip install coverage
-        $(pdm venv activate)
+        . .venv/bin/activate
         coverage run --source=. -m runtests
         coverage xml
     - name: Upload coverage to Codecov

.github/workflows/python-package.yml

@@ -40,5 +40,5 @@ jobs:
         flake8 . --config=flake8rc --count --exit-zero --max-complexity=100 --max-line-length=127 --statistics
     - name: Test with unpythonic.test.fixtures
       run: |
-        $(pdm venv activate)
+        . .venv/bin/activate
         python runtests.py