Update codecov/codecov-action from v1 to v4 (#171)

Author: white-gecko

.github/workflows/ci.yaml

@@ -34,4 +34,4 @@ jobs:
         run: python -m pytest
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v4