Bump certifi from 2023.5.7 to 2023.7.22 in /docs

Bumps [certifi](https://github.com/certifi/python-certifi) from 2023.5.7 to 2023.7.22.
- [Commits](certifi/python-certifi@2023.05.07...2023.07.22)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -8,7 +8,7 @@ alabaster==0.7.13
     # via sphinx
 babel==2.12.1
     # via sphinx
-certifi==2023.5.7
+certifi==2023.7.22
     # via requests
 charset-normalizer==3.1.0
     # via requests
@@ -20,8 +20,6 @@ idna==3.4
     # via requests
 imagesize==1.4.1
     # via sphinx
-importlib-metadata==6.6.0
-    # via sphinx
 jinja2==3.1.2
     # via sphinx
 markupsafe==2.1.2
@@ -30,22 +28,20 @@ packaging==23.1
     # via sphinx
 pygments==2.15.1
     # via sphinx
-pytz==2023.3
-    # via babel
 readthedocs-sphinx-search==0.3.1
-    # via -r docs/requirements.in
+    # via -r requirements.in
 requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
 sphinx==6.2.1
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   sphinx-rtd-theme
     #   sphinxcontrib-jquery
     #   sphinxnotes-strike
 sphinx-rtd-theme==1.2.1
-    # via -r docs/requirements.in
+    # via -r requirements.in
 sphinxcontrib-applehelp==1.0.4
     # via sphinx
 sphinxcontrib-devhelp==1.0.2
@@ -61,8 +57,6 @@ sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
 sphinxnotes-strike==1.2
-    # via -r docs/requirements.in
+    # via -r requirements.in
 urllib3==2.0.2
     # via requests
-zipp==3.15.0
-    # via importlib-metadata