[ja] Update content/ja/community/code-of-conduct.md

[kfess]

This is a Feature Request

What would you like to be added

Update the Japanese translation of content/ja/community/code-of-conduct.md to match the latest English version.

Website Link

• Japanese: https://kubernetes.io/ja/community/code-of-conduct/
• English: https://kubernetes.io/community/code-of-conduct/

Why is this needed

The current Japanese translation is outdated.

/area localization
/language ja
/assign

[Okabe-Junya]

FYI: CNCF CoC localization is outsourced. Since this page is a mirror, updating it directly may be difficult

(I suggest that you ask with CNCF team about the CoC localization before working on)

[Okabe-Junya]

/triage unresolved