[Snyk] Security upgrade nginx from 1.23.3-alpine to 1.25.2-alpine

[entlein]

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:1.25.2-alpine, as this image has only 5 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	Cleartext Transmission of Sensitive Information SNYK-ALPINE317-CURL-3320725	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE317-CURL-5958910	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE317-CURL-5958910	No Known Exploit
	829	Out-of-bounds Write SNYK-ALPINE317-LIBWEBP-5902239	Mature
	829	Resource Exhaustion SNYK-ALPINE317-NGHTTP2-5954769	Mature

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