Fixed the formatting for the Keeping Main Branch Stable empty callout

[gadgil48]

Closes #439

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries-incubator/python-intermediate-development/compare/md-outputs..md-outputs-PR-461

The following changes were observed in the rendered markdown documents:

 14-collaboration-using-git.md | 6 ++----
 md5sum.txt                    | 2 +-
 2 files changed, 3 insertions(+), 5 deletions(-)

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⏱️ Updated at 2025-05-29 13:00:01 +0000

[bielsnohr]

Thanks for the quick fix! LGTM