Re-enable codecov reporting (#281)

Author: davidparsson

.github/workflows/ci.yml

@@ -42,4 +42,6 @@ jobs:
         if which black; then black --check . ; fi
         check-manifest
     - name: Report coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v5
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}