fix: migrate from k8s.gcr.io to registry.k8s.io

[CIPHERTron]

What type of PR is this?
/kind cleanup

Any specific area of the project related to this PR?
/area registry

What this PR does / why we need it:
This PR migrates the image registry from k8s.gcr.io to registry.k8s.io

Which issue(s) this PR fixes:
[Umbrella Issue] Migrate CNCF Ecosystem projects from k8s.gcr.io to registry.k8s.io

Fixes kubernetes/k8s.io#4780

[poiana]

Welcome @CIPHERTron! It looks like this is your first PR to falcosecurity/plugins 🎉

[poiana]

Hi @CIPHERTron. Thanks for your PR.

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[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: CIPHERTron
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[CIPHERTron]

This PR is a duplicate of #232. Didn't know it was already there
Hence closing!