Bump certifi from 2021.10.8 to 2022.5.18

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.10.8 to 2022.5.18.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/commits)

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

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

Author: dependabot[bot]

docs-requirements.txt

@@ -8,7 +8,7 @@ alabaster==0.7.12
     # via sphinx
 babel==2.10.1
     # via sphinx
-certifi==2021.10.8
+certifi==2022.5.18
     # via requests
 charset-normalizer==2.0.12
     # via requests

test-requirements.txt

@@ -12,7 +12,7 @@ attrs==21.4.0
     # via pytest
 babel==2.10.1
     # via sphinx
-certifi==2021.10.8
+certifi==2022.5.18
     # via requests
 charset-normalizer==2.0.12
     # via requests