[Snyk] Security upgrade golang from 1.14-alpine to 1.21.9-alpine

[An0nYm0u5101]

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

• Dockerfile

We recommend upgrading to golang:1.21.9-alpine, as this image has only 1 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-ALPINE313-APKTOOLS-1533754	No Known Exploit
	614	Use After Free SNYK-ALPINE313-BUSYBOX-1920736	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE313-OPENSSL-1569448	No Known Exploit
	714	Buffer Overflow SNYK-ALPINE313-OPENSSL-1569448	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE313-ZLIB-2976175	No Known Exploit

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