build: bump certifi from 2022.6.15 to 2022.12.7 in /docs (#7452)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2022.6.15 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2022.06.15...2022.12.07)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
...

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

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

docs/requirements.txt

@@ -14,7 +14,7 @@ beautifulsoup4==4.11.1
     # via furo
 build==0.8.0
     # via pip-tools
-certifi==2022.6.15
+certifi==2022.12.7
     # via requests
 charset-normalizer==2.1.0
     # via requests
@@ -131,10 +131,6 @@ sphinxext-opengraph==0.6.3
     # via -r requirements.in
 sqlparse==0.4.2
     # via django
-tomli==2.0.1
-    # via
-    #   build
-    #   pep517
 tornado==6.2
     # via livereload
 urllib3==1.26.11