Revert "chore(deps): bump codecov/codecov-action from 3 to 4 (#276)" (#277)

This reverts commit 581b87e.

Author: tomplus

.github/workflows/test.yaml

@@ -47,7 +47,7 @@ jobs:
         isort -c --diff .
 
     - name: Send coverage report
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v3
       if: matrix.python-version == 3.11
       with:
         token: ${{ secrets.CODECOV_TOKEN }}