docs(kic): refer to kubernetes-configuration in KIC 3.4 >= docs

[czeslavo]

Description

Changes instructions for upgrading KIC CRDs switching from the ones stored in the KIC repository, to the new kong/kubernetes-configuration central repository. It also prepares the unreleased KIC 3.4 version.

Note: for upcoming KIC 3.4 this will point to not yet existing v1.0.0 kong/kubernetes-configuration tag. It will be released before KIC 3.4 and it's tracked as an explicit dependency: Kong/kubernetes-ingress-controller#6635

Part of Kong/kubernetes-ingress-controller#6580.

Testing instructions

Preview link: https://deploy-preview-8137--kongdocs.netlify.app/kubernetes-ingress-controller/unreleased/upgrade/kic/#update-custom-resource-definitions

Checklist

• Review label added
• Conditional version tags added, if applicable.

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