[Snyk] Security upgrade tornado from 6.2 to 6.4.2

[a-luna]

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

Snyk changed the following file(s):

• requirements-dev.txt

⚠️ Warning

virtualenv 20.26.6 has requirement distlib<1,>=0.3.7, but you have distlib 0.3.4.
virtualenv 20.26.6 has requirement importlib-metadata>=6.6; python_version < "3.8", but you have importlib-metadata 4.12.0.
virtualenv 20.26.6 has requirement filelock<4,>=3.12.2, but you have filelock 3.7.1.
virtualenv 20.26.6 has requirement platformdirs<5,>=3.9.1, but you have platformdirs 2.5.2.
jupyter-client 7.3.4 requires tornado, which is not installed.
ipykernel 6.15.0 requires ipython, which is not installed.
ipykernel 6.15.0 requires tornado, which is not installed.
ipdb 0.13.9 requires ipython, which is not installed.
flake8 4.0.1 has requirement importlib-metadata<4.3; python_version < "3.8", but you have importlib-metadata 4.12.0.
black 21.12b0 has requirement tomli<2.0.0,>=0.2.6, but you have tomli 2.0.1.

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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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Summary by Sourcery

Bug Fixes:

• Upgrade tornado from version 6.2 to 6.4.2 to address security vulnerabilities.

[sourcery-ai]

Reviewer's Guide by Sourcery

This is a security-focused pull request that upgrades the tornado package from version 6.2 to 6.4.2 to address a vulnerability. The change is implemented through a direct version update in the development requirements file.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Security upgrade of the tornado package to fix a vulnerability	Upgrade tornado from version 6.2 to 6.4.2 Address vulnerability SNYK-PYTHON-TORNADO-8400708 Update affects development dependencies only	requirements-dev.txt

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We have skipped reviewing this pull request. It seems to have been created by a bot ('[Snyk]' found in title). We assume it knows what it's doing!