[Snyk] Security upgrade nginx from 1.21 to 1.25.2

[Rubix982]

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

• web-server/Dockerfile

We recommend upgrading to nginx:1.25.2, as this image has only 89 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
	714	Exposure of Resource to Wrong Sphere SNYK-DEBIAN11-CURL-3065656	No Known Exploit
	721	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Proof of Concept
	721	Out-of-bounds Write SNYK-DEBIAN11-GLIBC-5927133	Proof of Concept
	829	Out-of-bounds Write SNYK-DEBIAN11-LIBWEBP-5893094	Mature
	829	Resource Exhaustion SNYK-DEBIAN11-NGHTTP2-5953384	Mature

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