[Snyk] Security upgrade nginx from 1.19.3-alpine to 1.20.2-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/prometheus_basic_auth_proxy/Dockerfile

We recommend upgrading to nginx:1.20.2-alpine, as this image has only 1 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-ALPINE312-CURL-1585256	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE312-OPENSSL-1569452	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE312-OPENSSL-1569452	No Known Exploit
	511	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE312-OPENSSL-2426332	No Known Exploit
	511	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE312-OPENSSL-2426332	No Known Exploit

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