ci: Added Codecov Token for Protected Main Uploads

Author: cmath10

.github/workflows/tests.yml

@@ -144,6 +144,7 @@ jobs:
       - name: Upload merged coverage to Codecov
         uses: codecov/codecov-action@v4
         with:
+          token: ${{ secrets.CODECOV_TOKEN }}
           files: coverage/lcov.info
           flags: combined
           name: combined-coverage