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

[OverStruck]

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

• webapp/Dockerfile.prod

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	Issue	Exploit Maturity
	Missing Encryption of Sensitive Data SNYK-ALPINE318-CURL-6104720	No Known Exploit
	Missing Encryption of Sensitive Data SNYK-ALPINE318-CURL-6104720	No Known Exploit
	CVE-2023-46218 SNYK-ALPINE318-CURL-6104721	No Known Exploit
	CVE-2023-46218 SNYK-ALPINE318-CURL-6104721	No Known Exploit

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8cf68d8) 79.71% compared to head (b79aec5) 79.71%.

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-2.0      #97   +/-   ##
========================================
  Coverage    79.71%   79.71%           
========================================
  Files           18       18           
  Lines          276      276           
========================================
  Hits           220      220           
  Misses          56       56           

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