[Snyk] Security upgrade alpine from 3.12 to 3.14.3

[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

• Dockerfile

We recommend upgrading to alpine:3.14.3, 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	Improper Handling of Exceptional Conditions SNYK-ALPINE312-BUSYBOX-1089799	No Known Exploit
	400	Improper Handling of Exceptional Conditions SNYK-ALPINE312-BUSYBOX-1089799	No Known Exploit

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[coveralls]

Pull Request Test Coverage Report for Build 1902153859

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 40.625%

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Totals
Change from base Build 1616533474:	0.0%
Covered Lines:	26
Relevant Lines:	64

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💛 - Coveralls