Bump codecov/codecov-action from 3.1.5 to 4.5.0 in the actions group across 1 directory (#398)

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: 3 people

.github/workflows/ci.yml

@@ -37,7 +37,8 @@ jobs:
           tox -e py
 
       - name: Upload coverage
-        uses: codecov/codecov-action@v3.1.5
-        if: always()
+        uses: codecov/codecov-action@v4
         with:
-          file: ./coverage.xml
+          flags: ${{ matrix.python-version }}
+          name: Python ${{ matrix.python-version }}
+          token: ${{ secrets.CODECOV_ORG_TOKEN }}