ci: remove CODECOV_TOKEN (org allows tokenless uploads)

Author: Ondrej Machala

.github/workflows/ci.yml

@@ -49,7 +49,6 @@ jobs:
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v4
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage/lcov.info,./coverage/toolbar/lcov.info
           fail_ci_if_error: false