[Snyk] Security upgrade nginx from 1.21-alpine to 1.23.1-alpine

[tiagoros]

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

• docker/management-ui/Dockerfile-nightly

We recommend upgrading to nginx:1.23.1-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	Incorrect Default Permissions SNYK-ALPINE315-CURL-2938004	No Known Exploit
	500	Incorrect Default Permissions SNYK-ALPINE315-CURL-2938004	No Known Exploit
	400	Inadequate Encryption Strength SNYK-ALPINE315-OPENSSL-2941810	No Known Exploit
	500	Out-of-bounds Read SNYK-ALPINE315-PCRE2-2869383	No Known Exploit
	500	Out-of-bounds Read SNYK-ALPINE315-PCRE2-2869384	No Known Exploit

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