upgrade ks: fix bug of gc pipelineruns

[yudong2015]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #982

Special notes for reviewers:

Please check the following list before waiting reviewers:

• Already committed the CRD files to the Helm Chart if you created some new CRDs
• Already added the permission for the new API
• Already added the RBAC markers for the new controllers

Does this PR introduce a user-facing change??

fix bug of GC pipelineruns

[chilianyi]

/lgtm
/approve

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chilianyi

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[yudong2015]

/cherrypick release-3.4

[ks-ci-bot]

@yudong2015: new pull request created: #1014

In response to this:

/cherrypick release-3.4

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