Bump certifi from 2020.12.5 to 2021.5.30 in /requirements (#17238)
Bump certifi from 2020.12.5 to 2021.5.30 in /requirements (#17238)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.12.5 to 2021.5.30.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2020.12.05...2021.05.30)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
mozilla/olympia,wagnerand/addons-server,bqbn/addons-server,bqbn/addons-server,diox/olympia,wagnerand/addons-server,mozilla/olympia,mozilla/addons-server,bqbn/addons-server,diox/olympia,diox/olympia,wagnerand/addons-server,mozilla/addons-server,wagnerand/addons-server,mozilla/addons-server,mozilla/olympia,bqbn/addons-server,mozilla/addons-server,diox/olympia,mozilla/olympia