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

This MR contains the following updates:

Package	Update	Change
ghcr.io/nginxinc/nginx-unprivileged	patch	1.25.3 -> 1.25.4

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Release Notes

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

v1.25.4

Compare Source

NGINX 1.25.4 (mainline)

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