[Snyk] Security upgrade redis from 6.2.1 to 6.2.8

[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

• redis/Dockerfile

We recommend upgrading to redis:6.2.8, as this image has only 43 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
	714	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	614	Improper Input Validation SNYK-DEBIAN10-GZIP-2444259	No Known Exploit
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN10-LIBGCRYPT20-1582894	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN10-LIBTASN16-3061094	No Known Exploit
	500	Out-of-bounds Write SNYK-DEBIAN10-ZLIB-2976149	No Known Exploit

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🦉 Use of a Broken or Risky Cryptographic Algorithm