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

[begonaalvarezd]

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

• contracts/wasm/fairroulette/frontend/Dockerfile

We recommend upgrading to nginx: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
	686	Resource Exhaustion SNYK-ALPINE318-EXPAT-6241039	No Known Exploit
	586	Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') SNYK-ALPINE318-EXPAT-6241040	No Known Exploit
	686	Use After Free SNYK-ALPINE318-LIBXML2-6245694	No Known Exploit

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🦉 Resource Exhaustion
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