[Snyk] Security upgrade node from 14.15.3-alpine to 14.21.0-alpine

[vs4vijay]

This PR was automatically created by Snyk using the credentials of a real user.

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:14.21.0-alpine, as this image has only 10 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
	614	Out-of-bounds Read SNYK-ALPINE311-APKTOOLS-1246343	No Known Exploit
	714	Out-of-bounds Read SNYK-ALPINE311-APKTOOLS-1534687	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE311-OPENSSL-1569451	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE311-OPENSSL-1569451	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE311-ZLIB-2977081	No Known Exploit

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[sonarcloud]

Quality Gate failed

Failed conditions
3 Security Hotspots

See analysis details on SonarCloud