[Snyk] Security upgrade node from 18.8-alpine3.16 to 18-alpine3.16

[cameri]

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.test

We recommend upgrading to node:18-alpine3.16, 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
	614	Insecure Randomness SNYK-UPSTREAM-NODE-3035792	No Known Exploit
	621	HTTP Request Smuggling SNYK-UPSTREAM-NODE-3035795	Proof of Concept
	625	Buffer Overflow SNYK-UPSTREAM-NODE-3092932	No Known Exploit
	721	Buffer Overflow SNYK-UPSTREAM-NODE-3092933	Proof of Concept
	614	DNS Rebinding SNYK-UPSTREAM-NODE-3105822	No Known Exploit

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