Merge pull request #303 from IFCA-Advanced-Computing/dependabot/github_actions/codecov/codecov-action-4

Bump codecov/codecov-action from 3 to 4

Author: Jaime Céspedes Sisniega

.github/workflows/code_coverage.yml

@@ -30,7 +30,7 @@ jobs:
         run: tox -e py39
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true