[Snyk] Security upgrade node from 16.4-alpine3.14 to 16.13.1-alpine3.14

[Starefossen]

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

• aksel.nav.no/Dockerfile

We recommend upgrading to node:16.13.1-alpine3.14, as this image has only 11 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
	500	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	471	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE314-OPENSSL-3314646	No Known Exploit
	471	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE314-OPENSSL-3314646	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE314-ZLIB-2976174	No Known Exploit

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