ci: token permissions - security slam task 16

[dalehenries]

What this PR does / why we need it:
Fixes token-permissions using the tool at https://app.stepsecurity.io/secureworkflow

#SecuritySlam

Which issue(s) this PR fixes:
Fixes task 16 in #2274

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[mrueg]

Thanks!

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dalehenries, mrueg

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