[Snyk] Fix for 10 vulnerabilities

[wwwillchen]

Snyk has created this PR to fix 10 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• build_defs/requirements.txt

⚠️ Warning

mkdocstrings 0.22.0 requires pymdown-extensions, which is not installed.
mkdocs-material 9.2.8 requires pymdown-extensions, which is not installed.
matplotlib 3.5.3 requires fonttools, which is not installed.
matplotlib 3.5.3 requires pillow, which is not installed.
Flask 2.2.5 requires Werkzeug, which is not installed.

---

Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.
• 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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---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 XML External Entity (XXE) Injection
🦉 Uncontrolled Resource Consumption ('Resource Exhaustion')
🦉 Eval Injection

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