Update docker.io/nginxinc/nginx-unprivileged Docker tag to v1.25.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/nginxinc/nginx-unprivileged	final	patch	1.25.3-alpine3.18-slim → 1.25.4-alpine3.18-slim

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Release Notes

nginx/docker-nginx-unprivileged (docker.io/nginxinc/nginx-unprivileged)

v1.25.4

Compare Source

NGINX 1.25.4 (mainline)

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