Update kube-webhook-certgen image 1.2.0->1.2.2

[Dean-Coakley]

Fixes: #8636

First contribution, there may be additional changes required that I'm unaware of.

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Hi @Dean-Coakley. Thanks for your PR.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Dean-Coakley
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[Dean-Coakley]

@medyagh Any additional changes required?

[minikube-bot]

Can one of the admins verify this patch?

[Dean-Coakley]

Closing in favor of a combined PR in #8692