Fix broken links in 00-introduction.ipynb with nbsphinx 0.9.2

[cpoerschke]

Checklist

• closes #xxxx
• pytest passes
• tests are included
• code is well formatted
• documentation renders correctly

What does this implement/fix? Explain your changes

Recent CI runs fail with Warning, treated as error: /home/runner/work/scikit-survival/scikit-survival/doc/user_guide/00-introduction.ipynb:35:undefined label: /user_guide/00-introduction.ipynb#the-veterans%27-administration-lung-cancer-trial and experimentally the link on https://scikit-survival.readthedocs.io/en/stable/user_guide/00-introduction.html is broken. The https://scikit-survival.readthedocs.io/en/latest/user_guide/00-introduction.html links work though.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d5fcbc9) 97.92% compared to head (dc07f00) 97.92%.

❗ Current head dc07f00 differs from pull request most recent head ad73a13. Consider uploading reports for the commit ad73a13 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #367   +/-   ##
=======================================
  Coverage   97.92%   97.92%           
=======================================
  Files          37       37           
  Lines        3323     3323           
  Branches      502      502           
=======================================
  Hits         3254     3254           
  Misses         33       33           
  Partials       36       36           

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[sebp]

It's strange that CI fails now. For me, the links to on the stable and latest docs work both fine. It might be that a newer version of sphinx (or its dependencies) is used on CI, compared to readthedocs.

[sebp]

I can confirm that this is caused by nbsphinx 0.9.2.

[sebp]

@cpoerschke Could you please change

scikit-survival/pyproject.toml

Line 95 in d5fcbc9

"nbsphinx",

to

"nbsphinx>=0.9.2",