[Snyk] Security upgrade ruby from 2.6.5-buster to 2.7-buster

[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.bullseye

We recommend upgrading to ruby:2.7-buster, as this image has only 369 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	Out-of-bounds Write SNYK-DEBIAN10-IMAGEMAGICK-539706	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN10-IMAGEMAGICK-539710	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-PYTHON37-1063182	No Known Exploit
	614	NULL Pointer Dereference SNYK-DEBIAN10-SUBVERSION-1071814	No Known Exploit

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