add codecov token

Author: bgmeulem

.github/workflows/test.yml

@@ -30,3 +30,5 @@ jobs:
     - name: Upload Coverage to Codecov
       uses: codecov/codecov-action@v2
       if: matrix.os == 'ubuntu-latest'
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}