[Snyk] Security upgrade nginx from 1.16.0-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

• 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 Write SNYK-ALPINE39-BZIP2-452847	No Known Exploit
	514	Out-of-bounds Write SNYK-ALPINE39-FREETYPE-1019627	Mature
	500	Out-of-bounds Write SNYK-ALPINE39-MUSL-458529	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE39-MUSL-458529	No Known Exploit
	400	NULL Pointer Dereference SNYK-ALPINE39-OPENSSL-588029	No Known Exploit

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