[Snyk] Security upgrade golang from 1.20.0 to 1.21.0

[powerman]

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

• bundle/go/Dockerfile

We recommend upgrading to golang:1.21.0, as this image has only 73 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	Integer Overflow or Wraparound SNYK-DEBIAN11-APR-3261105	No Known Exploit
	614	Directory Traversal SNYK-DEBIAN11-GIT-3319756	No Known Exploit
	614	Directory Traversal SNYK-DEBIAN11-GIT-3319756	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN11-NCURSES-2767191	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN11-NCURSES-2767191	No Known Exploit

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