chore(deps): update dependency kubernetes/kubernetes to v1.26.3 (#274)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [kubernetes/kubernetes](https://togithub.com/kubernetes/kubernetes) | patch | `v1.26.2` -> `v1.26.3` |

---

### Release Notes

<details>
<summary>kubernetes/kubernetes</summary>

### [`v1.26.3`](https://togithub.com/kubernetes/kubernetes/releases/tag/v1.26.3): Kubernetes v1.26.3

[Compare Source](https://togithub.com/kubernetes/kubernetes/compare/v1.26.2...v1.26.3)

See [kubernetes-announce@](https://groups.google.com/forum/#!forum/kubernetes-announce). Additional binary downloads are linked in the [CHANGELOG](https://togithub.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.26.md).

See [the CHANGELOG](https://togithub.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.26.md) for more details.

</details>

---

### Configuration

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

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/GoogleCloudPlatform/cloud-sql-proxy-operator).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNS44LjMiLCJ1cGRhdGVkSW5WZXIiOiIzNS44LjMifQ==-->

Author: renovate-bot

Makefile

@@ -436,7 +436,7 @@ CRD_REF_DOCS ?= $(LOCALBIN)/crd-ref-docs
 # Important note: avoid adding spaces in the macro declarations as any
 # additional whitespace will break the renovate regex rules.
 
-KUBECTL_VERSION=v1.26.2# renovate datasource=github-tags depName=kubernetes/kubernetes
+KUBECTL_VERSION=v1.26.3# renovate datasource=github-tags depName=kubernetes/kubernetes
 TERRAFORM_VERSION=v1.4.2# renovate datasource=github-tags depName=hashicorp/terraform
 
 CONTROLLER_TOOLS_VERSION=v0.11.3# renovate datasource=go depName=sigs.k8s.io/controller-tools