[Snyk] Security upgrade golang from 1.16.7-alpine to 1.16.13-alpine

[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

• docker/Dockerfile

We recommend upgrading to golang:1.16.13-alpine, 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	Priority Score / 1000	Issue	Exploit Maturity
	400	Use After Free SNYK-ALPINE314-BUSYBOX-1920713	No Known Exploit
	400	Use After Free SNYK-ALPINE314-BUSYBOX-1920718	No Known Exploit
	400	Use After Free SNYK-ALPINE314-BUSYBOX-1920720	No Known Exploit
	400	Use After Free SNYK-ALPINE314-BUSYBOX-1920722	No Known Exploit
	400	Use After Free SNYK-ALPINE314-BUSYBOX-1920733	No Known Exploit

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