[Snyk] Security upgrade fonttools from 4.38.0 to 4.43.0

[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.
oldest-supported-numpy 2023.12.12 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.
matplotlib 3.5.3 requires fonttools, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	XML External Entity (XXE) Injection SNYK-PYTHON-FONTTOOLS-6133203	fonttools: 4.38.0 -> 4.43.0	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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Learn how to fix vulnerabilities with free interactive lessons:

🦉 XML External Entity (XXE) Injection

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f2577b5) 99.52% compared to head (172d1de) 99.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #703   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          74       74           
  Lines       15487    15487           
  Branches     2084     2084           
=======================================
  Hits        15413    15413           
  Misses         50       50           
  Partials       24       24           

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