[Snyk] Security upgrade alpine from 3.14.2 to 3.14.6

[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

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

We recommend upgrading to alpine:3.14.6, 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-1920755	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE314-LIBRETLS-2432985	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE314-OPENSSL-2426333	No Known Exploit
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE314-OPENSSL-2426333	No Known Exploit
	471	Out-of-bounds Write SNYK-ALPINE314-ZLIB-2434419	No Known Exploit

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