[Snyk] Security upgrade node from 21.2-alpine3.18 to 21.7.3-alpine3.18

[simlarsen]

Snyk has created this PR to fix 0 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• Workflow/Dockerfile.tpl

We recommend upgrading to node:21.7.3-alpine3.18, as this image has only 9 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

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