fix(deps): update @pulumi/kubernetes to 4.21.1 (#6258)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@pulumi/kubernetes](https://pulumi.com)
([source](https://github.com/pulumi/pulumi-kubernetes)) |
dependencies | patch | [`4.21.0` ->
`4.21.1`](https://renovatebot.com/diffs/npm/@pulumi%2fkubernetes/4.21.0/4.21.1)
|

---

### Release Notes

<details>
<summary>pulumi/pulumi-kubernetes (@&#8203;pulumi/kubernetes)</summary>

###
[`v4.21.1`](https://github.com/pulumi/pulumi-kubernetes/blob/HEAD/CHANGELOG.md#4211-January-27-2025)

[Compare
Source](https://github.com/pulumi/pulumi-kubernetes/compare/v4.21.0...v4.21.1)

##### Added

- Windows executable releases are now signed.
([#&#8203;3455](https://github.com/pulumi/pulumi-kubernetes/pull/3455))

</details>

---

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