[Snyk] Security upgrade nginx from 1.19.3-alpine to 1.23.3-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:1.23.3-alpine, as this image has only 31 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	Out-of-bounds Read SNYK-ALPINE312-APKTOOLS-1533753	No Known Exploit
	500	Double Free SNYK-ALPINE312-CURL-1585256	No Known Exploit
	500	Double Free SNYK-ALPINE312-CURL-1585256	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE312-OPENSSL-1569452	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE312-ZLIB-2977082	No Known Exploit

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[secure-code-warrior-for-github]

Micro-Learning Topic: Buffer overflow (Detected by phrase)

Matched on "Buffer Overflow"

What is this? (2min video)

A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold or when a program attempts to put data in a memory area past a buffer.

Try a challenge in Secure Code Warrior

Micro-Learning Topic: Double free (Detected by phrase)

Matched on "Double Free"

What is this? (2min video)

Double free errors occur when free() is called more than once with the same memory address as an argument.

Try a challenge in Secure Code Warrior