Update pulumi-kubernetes to v4.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@pulumi/kubernetes (source)	4.14.0 -> 4.15.0
github.com/pulumi/pulumi-kubernetes/sdk/v4	v4.14.0 -> v4.15.0

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Release Notes

pulumi/pulumi-kubernetes (@​pulumi/kubernetes)

### [`v4.15.0`](https://togithub.com/pulumi/pulumi-kubernetes/blob/HEAD/CHANGELOG.md#4150-July-9-2024) [Compare Source](https://togithub.com/pulumi/pulumi-kubernetes/compare/v4.14.0...v4.15.0) ##### Changed - `CustomResource` should have plain `apiVersion` and `kind` properties ([https://github.com/pulumi/pulumi-kubernetes/pull/3079](https://togithub.com/pulumi/pulumi-kubernetes/pull/3079)) ##### Fixed - Prevent CustomResourceDefinitions from always being applied to the cluster during preview operations ([https://github.com/pulumi/pulumi-kubernetes/pull/3096](https://togithub.com/pulumi/pulumi-kubernetes/pull/3096))

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