[Snyk] Security upgrade golang from 1.19-buster to 1.20rc2-bullseye

[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

• docker/builder-go.dockerfile

We recommend upgrading to golang:1.20rc2-bullseye, as this image has only 109 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
	786	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232718	No Known Exploit
	786	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232718	No Known Exploit
	786	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232719	No Known Exploit
	786	Integer Overflow or Wraparound SNYK-DEBIAN10-GIT-3232719	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN10-LIBTASN16-3061094	No Known Exploit

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