Update quay.io/jetstack/cert-manager-approver-policy Docker tag to v0.15.1 - autoclosed

This MR contains the following updates:

Package	Update	Change
quay.io/jetstack/cert-manager-approver-policy	minor	v0.14.1 -> v0.15.1

Complete MR checklist

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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Upgrade Notices

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