feat: add ruby code block - bubble sort

[martinx]

If this pull request (PR) pertains to Chinese-to-English translation, please confirm that you have read the contribution guidelines and complete the checklist below:

• [ ] This PR represents the translation of a single, complete document, or contains only bug fixes.
• [ ] The translation accurately conveys the original meaning and intent of the Chinese version. If deviations exist, I have provided explanatory comments to clarify the reasons.

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[krahets]

Closed because the code and comments are not consistent with the reference code.