[Snyk] Security upgrade node from lts-alpine to 14.17.6-alpine3.11

[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

• sample-app/front-end/Dockerfile

We recommend upgrading to node:14.17.6-alpine3.11, 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	Issue	Exploit Maturity
	Out-of-bounds Read SNYK-ALPINE311-APKTOOLS-1534687	No Known Exploit
	Out-of-bounds Read SNYK-ALPINE311-OPENSSL-1569447	No Known Exploit
	Out-of-bounds Read SNYK-ALPINE311-OPENSSL-1569447	No Known Exploit
	Buffer Overflow SNYK-ALPINE311-OPENSSL-1569451	No Known Exploit
	Buffer Overflow SNYK-ALPINE311-OPENSSL-1569451	No Known Exploit

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