[Snyk] Security upgrade golang from 1.11-alpine to 1.21.3-alpine

[FauxFaux]

This PR was automatically created by Snyk using the credentials of a real user.

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

• scripts/go-builder-image/Dockerfile

We recommend upgrading to golang:1.21.3-alpine, as this image has only 2 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 Read SNYK-ALPINE310-APKTOOLS-1534688	No Known Exploit
	614	Integer Overflow or Wraparound SNYK-ALPINE310-OPENSSL-1075741	No Known Exploit
	614	Improper Certificate Validation SNYK-ALPINE310-OPENSSL-1089244	No Known Exploit
	614	Improper Certificate Validation SNYK-ALPINE310-OPENSSL-1089244	No Known Exploit
	614	NULL Pointer Dereference SNYK-ALPINE310-OPENSSL-587954	No Known Exploit

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