Update ko to go 1.20 in release task

[khrm]

This fixes CVE-2023-39325.

Changes

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As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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Release Notes

NONE

[khrm]

/kind security

[khrm]

/assign @dibyom @vdemeester

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: savitaashture

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[vdemeester]

/lgtm

[savitaashture]

/cherry-pick release-v0.25.x

[tekton-robot]

@savitaashture: new pull request created: #1674

In response to this:

/cherry-pick release-v0.25.x

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