[Snyk] Security upgrade nginx from 1.20.1-alpine to 1.23.2-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:1.23.2-alpine, as this image has only 11 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
	400	Improper Certificate Validation SNYK-ALPINE313-CURL-2938006	No Known Exploit
	500	Incorrect Default Permissions SNYK-ALPINE313-CURL-2938009	No Known Exploit
	500	Incorrect Default Permissions SNYK-ALPINE313-CURL-2938009	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE313-FREETYPE-2809176	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE313-ZLIB-2976175	No Known Exploit

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