[Snyk] Security upgrade golang from 1.15-alpine to 1.21.8-alpine

[irinazheltisheva]

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

• build/Dockerfile.alpine

We recommend upgrading to golang:1.21.8-alpine, as this image has only 0 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
	614	Use After Free SNYK-ALPINE314-BUSYBOX-1920734	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	614	Use After Free SNYK-ALPINE314-OPENSSL-3314637	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE314-ZLIB-2976174	No Known Exploit

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