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-preview[bot] <support@dependabot.com>

requirements.txt

@@ -1,7 +1,7 @@
 asn1crypto==1.4.0
 boto3==1.16.63
 bcrypt==3.2.0
-certifi==2020.12.5
+certifi==2021.5.30
 cffi==1.14.4
 chardet==4.0.0
 colander==1.8.3