[Snyk] Security upgrade nginx from 1.15.3-alpine to alpine

[meetmatt]

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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

• infra/dev/nginx/Dockerfile

We recommend upgrading to nginx:alpine, as this image has only 3 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	Priority Score / 1000	Issue	Exploit Maturity
	500	Double Free SNYK-ALPINE37-GD-343543	No Known Exploit
	571	Out-of-bounds Write SNYK-ALPINE37-GD-343926	Mature
	500	Improper Access Control SNYK-ALPINE37-LIBXSLT-343627	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	No Known Exploit

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