[release-8.1] test: fix trivy action

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1187

/assign andyzhangx

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot
Once this PR has been reviewed and has the lgtm label, please assign yuxiangqian for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[AndrewSirenko]

/close

superseded by #1244

[k8s-ci-robot]

@AndrewSirenko: Closed this PR.

In response to this:

/close

superseded by #1244

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.