Bump requests from 2.28.2 to 2.31.0 in /docs

Bumps [requests](https://github.com/psf/requests) from 2.28.2 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](https://github.com/psf/requests/compare/v2.28.2...v2.31.0)

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

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

docs/requirements.txt

@@ -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
@@ -33,7 +31,7 @@ packaging==23.0
     # via sphinx
 pygments==2.14.0
     # via sphinx
-requests==2.28.2
+requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
@@ -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