Remove outdated reference to cython

[jcohen02]

In relation to the disucssion in #209, this PR removes a left over reference to cython that could cause confusion for learners.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries-incubator/docker-introduction/compare/md-outputs..md-outputs-PR-249

The following changes were observed in the rendered markdown documents:

 creating-container-images.md | 3 ++-
 md5sum.txt                   | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

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⏱️ Updated at 2024-08-16 11:16:04 +0000

[sstevens2]

LGTM