Update azure/setup-kubectl action to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
azure/setup-kubectl	action	major	v3 -> v4

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Release Notes

azure/setup-kubectl (azure/setup-kubectl)

### [`v4`](https://togithub.com/azure/setup-kubectl/blob/HEAD/CHANGELOG.md#v400---2024-01-30) [Compare Source](https://togithub.com/azure/setup-kubectl/compare/v3...v4) ##### Changed - [#​90](https://togithub.com/azure/setup-kubectl/issues/90) Migrate to node 20 as node 16 is deprecated

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Configuration

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