Update nginxinc/nginx-unprivileged Docker tag to v1.31 (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nginxinc/nginx-unprivileged	final	minor	1.27-alpine → 1.31-alpine
nginxinc/nginx-unprivileged	stage	minor	1.27-alpine → 1.31-alpine

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[github-actions]

@renovate[bot] PR doc deploy will soon be available for review on https://stakater.github.io/mto-docs/renovate-main-nginxinc-nginx-unprivileged-1.x

[github-actions]

@renovate[bot] Image is available for testing. docker pull ghcr.io/stakater/template-operator-docs:SNAPSHOT-PR-8-bed10e08

[github-actions]

@renovate[bot] PR doc deploy will soon be available for review on https://stakater.github.io/mto-docs/renovate-main-nginxinc-nginx-unprivileged-1.x

[github-actions]

@renovate[bot] Image is available for testing. docker pull ghcr.io/stakater/template-operator-docs:SNAPSHOT-PR-8-66123351