Bump certifi from 2021.5.30 to 2021.10.8

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.5.30 to 2021.10.8.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2021.05.30...2021.10.08)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs-requirements.txt

@@ -8,7 +8,7 @@ alabaster==0.7.12
     # via sphinx
 babel==2.9.0
     # via sphinx
-certifi==2021.5.30
+certifi==2021.10.8
     # via requests
 charset-normalizer==2.0.1
     # via requests

test-requirements.txt

@@ -12,7 +12,7 @@ attrs==21.2.0
     # via pytest
 babel==2.9.0
     # via sphinx
-certifi==2021.5.30
+certifi==2021.10.8
     # via requests
 charset-normalizer==2.0.1
     # via requests