New test - Update canonical-data.json

[karginoleg]

Add test to check if two unordered lists are separated properly

[github-actions]

Hello. Thanks for opening a PR on Exercism 🙂

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Note: If this PR has been pre-approved, please link back to this PR on the forum thread and a maintainer or staff member will reopen it.

[IsaacG]

Ongoing forum discussion: https://forum.exercism.org/t/markdown-add-new-test/12652/7

Please do not reopen PR until there is maintainer agreement that we want to proceed here.