Add owners for podsecuritypolicy package

[liggitt]

adds authors and sig-auth approvers/reviewers to the podsecuritypolicy package

NONE

[smarterclayton]

/approve
/lgtm

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: liggitt, smarterclayton

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Needs approval from an approver in each of these OWNERS Files:

• pkg/OWNERS [smarterclayton]

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[k8s-github-robot]

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here.

[k8s-github-robot]

[MILESTONENOTIFIER] Milestone Pull Request Labels Incomplete

@dchen1107 @liggitt @smarterclayton

Action required: This pull request requires label changes. If the required changes are not made within 2 days, the pull request will be moved out of the v1.9 milestone.

kind: Must specify exactly one of kind/bug, kind/cleanup or kind/feature.
priority: Must specify exactly one of priority/critical-urgent, priority/important-longterm or priority/important-soon.
sig owner: Must specify at least one label prefixed with sig/.

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