[Snyk] Security upgrade golang from 1.10-alpine to 1.21.8-alpine

[howardfackrell]

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:1.21.8-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
	714	Out-of-bounds Write SNYK-ALPINE39-MUSL-458529	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE39-MUSL-458529	No Known Exploit
	614	Improper Certificate Validation SNYK-ALPINE39-OPENSSL-1089232	No Known Exploit
	614	Use of a Broken or Risky Cryptographic Algorithm SNYK-ALPINE39-OPENSSL-340660	No Known Exploit
	614	NULL Pointer Dereference SNYK-ALPINE39-OPENSSL-588029	No Known Exploit

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Use of a Broken or Risky Cryptographic Algorithm
🦉 NULL Pointer Dereference