[Snyk] Security upgrade markdown from 3.4.4 to 3.8.1

[ananos]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• requirements.txt

⚠️ Warning

mkdocs-material 9.2.8 has requirement pymdown-extensions~=10.3, but you have pymdown-extensions 10.2.1.

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• 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.

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