Update dependency kubernetes/kubernetes to v1.30.6

[gardener-ci-robot]

This PR contains the following updates:

Package	Update	Change
kubernetes/kubernetes	patch	v1.30.5 -> v1.30.6

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Release Notes

kubernetes/kubernetes (kubernetes/kubernetes)

### [`v1.30.6`](https://redirect.github.com/kubernetes/kubernetes/releases/tag/v1.30.6): Kubernetes v1.30.6 [Compare Source](https://redirect.github.com/kubernetes/kubernetes/compare/v1.30.5...v1.30.6) See [kubernetes-announce@](https://groups.google.com/forum/#!forum/kubernetes-announce). Additional binary downloads are linked in the [CHANGELOG](https://redirect.github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.30.md). See [the CHANGELOG](https://redirect.github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.30.md) for more details.

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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Release note:

`kubernetes/kubernetes` has been updated to `v1.30.6`. [Release Notes](https://redirect.github.com/kubernetes/kubernetes/releases/tag/v1.30.6)

[gardener-robot]

@gardener-ci-robot Thank you for your contribution.

[mimiteto]

/lgtm