[Snyk] Security upgrade nginx from mainline-alpine to 1.25.3-alpine3.18

[tarlepp]

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:1.25.3-alpine3.18, 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
	514	Out-of-bounds Read SNYK-ALPINE318-LIBX11-6042396	No Known Exploit
	514	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE318-LIBX11-6042397	No Known Exploit
	614	Integer Overflow or Wraparound SNYK-ALPINE318-LIBX11-6042398	No Known Exploit
	586	Improper Check for Unusual or Exceptional Conditions SNYK-ALPINE318-OPENSSL-6055795	No Known Exploit
	586	Improper Check for Unusual or Exceptional Conditions SNYK-ALPINE318-OPENSSL-6055795	No Known Exploit

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