[Snyk] Security upgrade mistune from 0.8.4 to 2.0.3

[xoriole]

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

pyipv8 2.8.0 requires aiohttp-apispec, which is not installed.
pyipv8 2.8.0 requires aiohttp, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-MISTUNE-2940625	mistune: 0.8.4 -> 2.0.3	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:

🦉 Regular Expression Denial of Service (ReDoS)

[drew2a]

The documentation build ended with the error:

  × Running setup.py install for m2r did not run successfully.
  │ exit code: 1
  ╰─> [8 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-plhanjve/m2r_81d85504a29e413b8f05566d0f11c8eb/setup.py", line 14, in <module>
          from m2r import parse_from_file
        File "/tmp/pip-install-plhanjve/m2r_81d85504a29e413b8f05566d0f11c8eb/m2r.py", line 59, in <module>
          class RestBlockGrammar(mistune.BlockGrammar):
      AttributeError: module 'mistune' has no attribute 'BlockGrammar'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> m2r

note: This is an issue with the package mentioned above, not pip.
hint: See above for output from the failure.
Error: Process completed with exit code 1.

[devos50]

This is a known issue:

tribler/doc/requirements.txt

Line 10 in ea6e621

mistune==0.8.4 # sphinxcontrib-openapi==0.7.0 cannot work with the latest mistune version (2.0.0)

Also see prior issues such as #6844 (comment) and #6624. As such, we cannot merge this PR without breaking the documentation build.

[kozlovsky]

sphinxcontrib-openapi compatibility with mistune 2.0.x is not fixed yet, see #6624