Bump certifi from 2021.5.30 to 2022.12.7 in /doc/src/sphinx (#399)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.5.30 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2021.05.30...2022.12.07)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Luigi Marini <[email protected]>

Author: dependabot[bot]

doc/src/sphinx/requirements.txt

@@ -3,7 +3,7 @@ sphinx-rtd-theme==0.5.0
 sphinx_design==0.0.13
 alabaster==0.7.12
 babel==2.9.1
-certifi==2021.5.30
+certifi==2022.12.7
 chardet==4.0.0
 commonmark==0.9.1
 docutils==0.16