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

This MR contains the following updates:

Package	Type	Update	Change
nginxinc/nginx-unprivileged	ironbank-docker	patch	1.25.3-alpine -> 1.25.4-alpine
nginxinc/nginx-unprivileged	stage	patch	1.25.3-alpine -> 1.25.4-alpine

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Release Notes

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

v1.25.4

Compare Source

NGINX 1.25.4 (mainline)

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