Update nginxinc/nginx-unprivileged Docker tag to v1.25.0

This MR contains the following updates:

Package	Type	Update	Change
nginxinc/nginx-unprivileged	ironbank-docker	minor	1.24.0 -> 1.25.0
nginxinc/nginx-unprivileged		minor	1.24.0 -> 1.25.0
nginxinc/nginx-unprivileged	stage	minor	1.24.0 -> 1.25.0

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