[Snyk] Security upgrade nginx from 1.19.3-alpine to mainline-alpine#21

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-47f50df2042c8690d0fa5b782af0ec09

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Commits on Jul 8, 2021

fix: devenv/docker/blocks/nginx_proxy_mac/Dockerfile to reduce vulnerabilities
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