Restore http link

[ostephens]

Closes #325
An http link had been incorrectly changed to https. This corrects the protocol so the link works.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-open-refine/compare/md-outputs..md-outputs-PR-326

The following changes were observed in the rendered markdown documents:

 instructor-notes.md | 2 +-
 md5sum.txt          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2023-11-21 11:05:25 +0000