Bump certifi from 2020.6.20 to 2020.11.8

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.6.20 to 2020.11.8.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2020.06.20...2020.11.08)