fix: correct challenge formatting

[alee]

closes #661

[github-actions]

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🔍 Inspect the changes: https://github.com/swcarpentry/python-novice-gapminder/compare/md-outputs..md-outputs-PR-662

The following changes were observed in the rendered markdown documents:

 08-data-frames.md | 4 ----
 md5sum.txt        | 2 +-
 2 files changed, 1 insertion(+), 5 deletions(-)

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⏱️ Updated at 2023-08-29 21:11:03 +0000