chore(deps): update container image nginxinc/nginx-unprivileged to 1.25.3@a7ef461 (#15718)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[nginxinc/nginx-unprivileged](https://togithub.com/nginxinc/docker-nginx-unprivileged)
| digest | `a4cb3ee` -> `a7ef461` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Configuration

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

🚦 **Automerge**: Enabled.

♻ **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.

---

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

---

This PR has been generated by [Renovate
Bot](https://togithub.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy44MS40IiwidXBkYXRlZEluVmVyIjoiMzcuODEuNCIsInRhcmdldEJyYW5jaCI6Im1hc3RlciJ9-->

charts/stable/nextcloud/values.yaml

@@ -5,7 +5,7 @@ image:
 nginxImage:
   repository: nginxinc/nginx-unprivileged
   pullPolicy: IfNotPresent
-  tag: 1.25.3@sha256:a4cb3ee8f71116750ae3dc857031b7c74ec3b21df3d878e1c63204c206553e46
+  tag: 1.25.3@sha256:a7ef4617598260e19c3b20262263f7293b06845a920b7dd242a17c4b749f8efd
 imaginaryImage:
   repository: tccr.io/truecharts/nextcloud-imaginary
   pullPolicy: IfNotPresent