version to 2.12.0

[YangSen-qn]

变更背景描述

jira issue链接

KODO-18079

主要变更点

• [ ] fix bug
• [ ] new feature
• [ ] 不兼容变更

Checklist

• [x] 已自测
• [x] 已更新Readme

[qiniu-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: YangSen-qn To complete the pull request process, please assign mei-zhao You can assign the PR to them by writing /assign @mei-zhao in a comment when ready.

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[qiniu-bot]

Hi @YangSen-qn. Thanks for your PR.

I'm waiting for a qiniu member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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