[Snyk] Security upgrade nginx from alpine to 1.21.6-alpine

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• devenv/docker/blocks/nginx_proxy_mac/Dockerfile

We recommend upgrading to nginx:1.21.6-alpine, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Issue	Exploit Maturity
	CVE-2022-28391 SNYK-ALPINE315-BUSYBOX-2440607	No Known Exploit
	CVE-2022-28391 SNYK-ALPINE315-BUSYBOX-2440607	No Known Exploit

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[mistaken-pull-closer[bot]]

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[pull-dog[bot]]

*Ruff* :dog: I wasn't able to find any Docker Compose files in your repository at any of the given paths in the pull-dog.json configuration file, or the default docker-compose.yml file :weary: Make sure the given paths are correct.

Files checked:

• docker-compose.yml

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