[Snyk] Security upgrade nbconvert from 5.6.1 to 7.17.0

[aaronmanne]

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

convert 7.6.0 has requirement nbformat>=5.7, but you have nbformat 4.4.0.
nbconvert 7.6.0 has requirement traitlets>=5.1, but you have traitlets 4.3.3.
nbconvert 7.6.0 has requirement mistune<4,>=2.0.3, but you have mistune 0.8.4.
nbconvert 7.6.0 has requirement jupyter-core>=4.7, but you have jupyter-core 4.6.1.
nbclient 0.7.4 has requirement jupyter-client>=6.1.12, but you have jupyter-client 5.3.4.
nbclient 0.7.4 has requirement traitlets>=5.3, but you have traitlets 4.3.3.
nbclient 0.7.4 has requirement jupyter-core!=5.0.*,>=4.12, but you have jupyter-core 4.6.1.
nbclient 0.7.4 has requirement nbformat>=5.1, but you have nbformat 4.4.0.
jupyter-console 6.0.0 has requirement prompt-toolkit<2.1.0,>=2.0.0, but you have prompt-toolkit 3.0.2.

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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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