[Snyk] Security upgrade requests from 2.31.0 to 2.32.0

[bashtage]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • doc/requirements.txt

⚠️ Warning

statsmodels 0.13.5 requires scipy, which is not installed.
statsmodels 0.13.5 requires scipy, which is not installed.
sphinx 5.3.0 requires requests, which is not installed.
sphinx-immaterial 0.11.0 requires requests, which is not installed.
qtconsole 5.4.4 requires pyzmq, which is not installed.
oldest-supported-numpy 2023.12.21 has requirement numpy==1.14.5; python_version == "3.7" and platform_machine not in "arm64|aarch64|loongarch64" and platform_system != "AIX" and platform_python_implementation != "PyPy", but you have numpy 1.21.3.
notebook 6.5.7 requires pyzmq, which is not installed.
nbclassic 1.0.0 requires pyzmq, which is not installed.
matplotlib 3.5.3 requires fonttools, which is not installed.
jupyter-server 1.24.0 requires pyzmq, which is not installed.
jupyter-console 6.6.3 requires pyzmq, which is not installed.
jupyter-client 7.4.9 requires pyzmq, which is not installed.
ipykernel 6.16.2 requires pyzmq, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	566/1000 Why? Recently disclosed, Has a fix available, CVSS 5.6	Always-Incorrect Control Flow Implementation SNYK-PYTHON-REQUESTS-6928867	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the affected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

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