kgo: make Gateway API APIVersion, depend on KGO version

[pmalek]

Description

Make version of Gateway API APIVersion depend on KGO version.

Testing instructions

Preview links

• https://deploy-preview-7686--kongdocs.netlify.app/gateway-operator/latest/get-started/kic/create-gateway/
• https://deploy-preview-7686--kongdocs.netlify.app/gateway-operator/latest/get-started/kic/create-route/
• https://deploy-preview-7686--kongdocs.netlify.app/gateway-operator/latest/guides/ai-gateway/
• https://deploy-preview-7686--kongdocs.netlify.app/gateway-operator/1.3.x/customization/data-plane-image/#using-gatewayconfiguration

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

[github-actions[bot]]

:warning: Please add at least one of the following review labels to this PR:

• review:copyedit: Request for writer review.
• review:general: Review for general accuracy and presentation. Does the doc work? Does it output correctly?
• review:tech: Request for technical review for a docs platform change.
• review:sme: Request for review from an SME (engineer, PM, etc.).

Note: Only Kong employees can add labels due to a GitHub limitation. If you're an OSS contributor, thank you! The maintainers will label this PR for you.

[netlify[bot]]

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