[Snyk] Security upgrade node from 18.1.0-slim to 18.2-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

• Dockerfile

We recommend upgrading to node:18.2-slim, as this image has only 44 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-DEBIAN11-DPKG-2847942	No Known Exploit
	500	OS Command Injection SNYK-DEBIAN11-OPENSSL-2807596	No Known Exploit
	221	CVE-2022-2068 SNYK-DEBIAN11-OPENSSL-2933518	No Known Exploit
	150	Information Exposure SNYK-DEBIAN11-UTILLINUX-2401081	No Known Exploit
	150	Information Exposure SNYK-DEBIAN11-UTILLINUX-2401081	No Known Exploit

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