[Snyk] Security upgrade alpine from 3.14.2 to 3.16.7

[ekmixon]

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

• packages/grafana-toolkit/docker/grafana-plugin-ci-alpine/Dockerfile

We recommend upgrading to alpine:3.16.7, 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
	614	Use After Free SNYK-ALPINE314-BUSYBOX-1920713	No Known Exploit
	614	Use After Free SNYK-ALPINE314-BUSYBOX-1920718	No Known Exploit
	614	Use After Free SNYK-ALPINE314-BUSYBOX-1920734	No Known Exploit
	614	Use After Free SNYK-ALPINE314-BUSYBOX-1920744	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE314-ZLIB-2976174	No Known Exploit

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[secure-code-warrior-for-github]

Micro-Learning Topic: Use-after-free (Detected by phrase)

Matched on "Use After Free"

What is this? (2min video)

Dereferencing pointers to objects that have already been freed opens the door to execution of arbitrary code. Attackers may be able to insert instructions at the freed memory location in order to trigger the exploit when the pointer is used after the memory has been freed.

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