Bump certifi from 2022.12.7 to 2023.7.22 in /docs

Bumps [certifi](https://github.com/certifi/python-certifi) from 2022.12.7 to 2023.7.22.
- [Commits](https://github.com/certifi/python-certifi/compare/2022.12.07...2023.07.22)

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

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

docs/requirements.txt

@@ -10,7 +10,7 @@ babel==2.12.1
     # via sphinx
 breathe==4.35.0
     # via -r requirements.in
-certifi==2022.12.7
+certifi==2023.7.22
     # via requests
 charset-normalizer==3.1.0
     # via requests
@@ -23,8 +23,6 @@ idna==3.4
     # via requests
 imagesize==1.4.1
     # via sphinx
-importlib-metadata==6.0.0
-    # via sphinx
 jinja2==3.1.2
     # via sphinx
 markupsafe==2.1.2
@@ -59,8 +57,6 @@ sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
 urllib3==1.26.15
     # via requests
-zipp==3.15.0
-    # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools