[Snyk] Security upgrade nbconvert from 7.6.0 to 7.17.0

[bashtage]

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

Snyk changed the following file(s):

• doc/requirements.txt

⚠️ Warning

sphinx-immaterial 0.11.0 requires requests, which is not installed.
sphinx-immaterial 0.11.0 requires sphinx, which is not installed.
nbsphinx 0.9.7 requires nbconvert, which is not installed.
nbsphinx 0.9.7 requires sphinx, which is not installed.

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• 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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.40%. Comparing base (7f46fca) to head (3e3ac94).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #427      +/-   ##
==========================================
- Coverage   95.55%   95.40%   -0.15%     
==========================================
  Files          56       56              
  Lines        8752     8752              
  Branches      175      175              
==========================================
- Hits         8363     8350      -13     
- Misses        375      387      +12     
- Partials       14       15       +1     

Flag	Coverage Δ
adder	95.29% <ø> (-0.14%)	⬇️
subtractor	95.29% <ø> (-0.14%)	⬇️

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