[Snyk] Security upgrade nginx from 1.15 to 1.25

[snyk-bot]

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

• docker/demo/Dockerfile

We recommend upgrading to nginx:1.25, as this image has only 95 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	Directory Traversal SNYK-DEBIAN9-DPKG-2847943	No Known Exploit
	614	Out-of-bounds Write SNYK-DEBIAN9-LIBXML2-1277339	No Known Exploit
	614	Use After Free SNYK-DEBIAN9-LIBXML2-1277342	No Known Exploit
	614	Use After Free SNYK-DEBIAN9-LIBXML2-1277344	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN9-LIBXML2-429367	No Known Exploit

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