fix upload-artifact@v4

Author: staskh

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
         token: ${{ secrets.CODECOV_TOKEN }}
 
     - name: Upload coverage to Codecov
-      #if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11'
+      if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11'
       uses: codecov/codecov-action@v5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}