ci: add CODECOV_TOKEN to fix coverage uploads on protected branches

Author: ferrolho

.github/workflows/CI.yml

@@ -27,6 +27,7 @@ jobs:
       - uses: codecov/codecov-action@v5
         with:
           files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
   format:
     name: Format check
     runs-on: ubuntu-latest