[Snyk] Security upgrade nginx from 1.16.1-alpine to 1.23.2-alpine

[adamlaska]

This PR was automatically created by Snyk using the credentials of a real user.

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:1.23.2-alpine, as this image has only 0 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-ALPINE310-APKTOOLS-1534688	No Known Exploit
	514	Out-of-bounds Write SNYK-ALPINE310-FREETYPE-1019641	Mature
	571	Off-by-one Error SNYK-ALPINE310-NGINX-1297082	Mature
	400	Improper Certificate Validation SNYK-ALPINE310-OPENSSL-1089244	No Known Exploit
	400	NULL Pointer Dereference SNYK-ALPINE310-OPENSSL-587954	No Known Exploit

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