[Snyk] Security upgrade node from 18.2.0-bullseye-slim to 18.5-bullseye-slim

[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

• frontend/Dockerfile

We recommend upgrading to node:18.5-bullseye-slim, as this image has only 43 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
	586	HTTP Request Smuggling SNYK-UPSTREAM-NODE-2946428	No Known Exploit
	586	Configuration Hijacking SNYK-UPSTREAM-NODE-2946717	No Known Exploit
	586	HTTP Request Smuggling SNYK-UPSTREAM-NODE-2946723	No Known Exploit
	586	DLL Hijacking SNYK-UPSTREAM-NODE-2946727	No Known Exploit
	586	Information Exposure SNYK-UPSTREAM-NODE-2946729	No Known Exploit

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