[Snyk] Security upgrade ruby from 2.4 to 2.6.7

[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 ruby:2.6.7, as this image has only 333 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	Integer Overflow or Wraparound SNYK-DEBIAN10-OPENSSL-1075326	No Known Exploit
	714	NULL Pointer Dereference SNYK-DEBIAN10-OPENSSL-567125	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN10-PERL-570792	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-PERL-570797	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-PERL-570802	No Known Exploit

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