fix(deps): update container image nginxinc/nginx-unprivileged to 1.25.3 (#15146)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[nginxinc/nginx-unprivileged](https://togithub.com/nginxinc/docker-nginx-unprivileged)
| digest | `d47e891` -> `198442e` |

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charts/stable/nextcloud/values.yaml

@@ -5,7 +5,7 @@ image:
 nginxImage:
   repository: nginxinc/nginx-unprivileged
   pullPolicy: IfNotPresent
-  tag: 1.25.3@sha256:d47e89176fcf7a83aaf220ea1c560cb232cb9646144eec5be742575df5d9ccc5
+  tag: 1.25.3@sha256:198442edfc1f70ffa15c21ba80976903ff376b9aba3c77b11148f2018f2928b9
 imaginaryImage:
   repository: tccr.io/truecharts/nextcloud-imaginary
   pullPolicy: IfNotPresent