upload to codecov using the token

This should fix the timeouts caused by GitHub rate-limiting CodeCov.io

codecov/codecov-action#598

Author: mr-c

.github/workflows/ci-tests.yml

@@ -74,6 +74,7 @@ jobs:
         uses: codecov/[email protected]
         with:
           fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   tox-style:
     name: CI linters via Tox