Update docker.io/nginxinc/nginx-unprivileged Docker tag to v1.27.3

This MR contains the following updates:

Package	Type	Update	Change
docker.io/nginxinc/nginx-unprivileged	final	minor	1.21.3-alpine -> 1.27.3-alpine

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Release Notes

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

v1.27.3

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1.27.3 (mainline)

v1.27.2

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1.27.2 (mainline)

v1.27.1

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1.27.1 (mainline)

v1.27.0

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1.27.0 (mainline)

v1.26.2

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NGINX 1.26.2 (stable)

v1.26.1

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NGINX 1.26.1 (stable)

v1.26.0

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NGINX 1.26.0 (stable)

v1.25.5

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NGINX 1.25.5 (mainline)

v1.25.4

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NGINX 1.25.4 (mainline)

v1.25.3

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NGINX 1.25.3 (mainline)

v1.25.2

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NGINX 1.25.2 (mainline)

v1.25.1

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NGINX 1.25.1 (mainline)

v1.25.0

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NGINX 1.25.0 (mainline)

v1.24.0

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NGINX 1.24.0 (stable)

v1.23.4

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NGINX 1.23.4 (mainline)

v1.23.3

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NGINX 1.23.3 (mainline)

v1.23.2

NGINX 1.23.2 (mainline)

v1.22.1

NGINX 1.22.1 (stable)

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