Update ci.yml for codecov v4 (#229)

Author: JeffFessler

.github/workflows/ci.yml

@@ -34,4 +34,5 @@ jobs:
       - uses: codecov/codecov-action@v4
         if: ${{ matrix.version == '1' && matrix.os == 'ubuntu-latest' }}
         with:
+          token: ${{ secrets.CODECOV_TOKEN }}
           file: lcov.info