Bump nginx from 1.15.10-alpine to 1.17.3-alpine in /1.2.1/nginx-mainline/alpine#13

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dependabot/docker/1.2.1/nginx-mainline/alpine/nginx-1.17.3-alpineLCMApps/docker-nginx-rtmp:dependabot/docker/1.2.1/nginx-mainline/alpine/nginx-1.17.3-alpineCopy head branch name to clipboard