chore(apps/prod/cloudevents-server): bump image tag to 403acb5

[wuhuizuo]

Ref: PingCAP-QE/ee-apps#79

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.
The pull request seems to be a simple update of the image tag for a CloudEvents server in a Kubernetes environment. The change replaces the current image tag '0f5542f' with '403acb5'. The change looks straightforward and there are no code changes associated with this pull request.

Potential problems:

• None found

Suggestions:

• None needed.

[wuhuizuo]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wuhuizuo

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