[Snyk] Security upgrade redis from alpine3.12 to 6.0.14-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

• masscrm_back/docker/redis/Dockerfile

We recommend upgrading to redis:6.0.14-alpine, as this image has only 3 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	Out-of-bounds Read SNYK-ALPINE312-APKTOOLS-1533753	No Known Exploit
	400	Integer Overflow or Wraparound SNYK-ALPINE312-OPENSSL-1075735	No Known Exploit
	400	Integer Overflow or Wraparound SNYK-ALPINE312-OPENSSL-1075735	No Known Exploit
	400	Improper Certificate Validation SNYK-ALPINE312-OPENSSL-1089238	No Known Exploit
	400	Improper Certificate Validation SNYK-ALPINE312-OPENSSL-1089238	No Known Exploit

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