[Snyk] Fix for 19 vulnerabilities

[senalw]

Snyk has created this PR to fix 19 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• py/examples/requirements.txt

⚠️ Warning

matplotlib 3.5.1 requires fonttools, which is not installed.
matplotlib 3.5.1 requires pillow, which is not installed.
bokeh 2.4.2 requires tornado, which is not installed.
bokeh 2.4.2 requires pillow, 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
🦉 NULL Pointer Dereference
🦉 Uncontrolled Resource Consumption ('Resource Exhaustion')
🦉 More lessons are available in Snyk Learn

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