Bump kop version to 2.12.0.1-SNAPSHOT

[streamnativebot]

This is a PR created by snbot to trigger the check suite in each repository.

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:white_check_mark: Demogorgon314
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[github-actions[bot]]

@streamnativebot:Thanks for your contribution. For this PR, do we need to update docs? (The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)