Only track coverage for lazy-loader, not tests

Author: stefanv

.github/workflows/coverage.yml

@@ -29,9 +29,9 @@ jobs:
 
       - name: Measure test coverage
         run: |
-          python -m pytest --cov --durations=10
+          python -m pytest --cov=src --durations=10
           # Tests fail if using `--doctest-modules`. I.e.,
-          # python -m pytest --cov=lazy_loader --doctest-modules --durations=20
+          # python -m pytest --cov=src --durations=10 --doctest-modules
 
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5