[Snyk] Security upgrade node from 16.6.0-slim to gallium-buster-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:gallium-buster-slim, as this image has only 68 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
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	221	CVE-2022-0563 SNYK-DEBIAN10-UTILLINUX-2401082	No Known Exploit
	221	CVE-2022-0563 SNYK-DEBIAN10-UTILLINUX-2401082	No Known Exploit

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