Bump certifi from 2020.12.5 to 2021.5.30

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](certifi/python-certifi@2020.12.05...2021.05.30)

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

requirements.txt

@@ -1,4 +1,4 @@
-certifi==2020.12.5
+certifi==2021.5.30
 chardet==4.0.0
 idna==3.1
 Jinja2==3.0.1