The gcr.io/kubebuilder/kube-rbac-proxy image is no longer available
since GCR was deprecated. Replace it with quay.io/brancz/kube-rbac-proxy
from the original upstream author.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

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## Summary
- Replace deprecated `gcr.io/kubebuilder/kube-rbac-proxy:v0.16.0` with
`quay.io/brancz/kube-rbac-proxy:v0.18.1` in the vendored etcd-operator
chart
- The GCR-hosted image became unavailable after March 18, 2025

Fixes #2172 #488

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Updated proxy component to v0.18.1 with configuration changes for
improved stability and compatibility.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

kvaps added a commit that referenced this pull request

…ac-proxy image (#2183)

# Description
Backport of #2181 to `release-1.0`.

kvaps added a commit that referenced this pull request

…ac-proxy image (#2182)

# Description
Backport of #2181 to `release-1.1`.