[Snyk] Security upgrade nginx from 1.22.0-alpine to 1.23.2-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

• web/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
	221	CVE-2022-40304 SNYK-ALPINE316-LIBXML2-3050523	No Known Exploit
	221	CVE-2022-40303 SNYK-ALPINE316-LIBXML2-3050527	No Known Exploit
	221	Out-of-bounds Write SNYK-ALPINE316-NGINX-3055741	No Known Exploit
	221	Out-of-bounds Write SNYK-ALPINE316-NGINX-3055742	No Known Exploit

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