[Snyk] Security upgrade golang from 1.18 to 1.21rc3

[svc-snyk-github]

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.integration

We recommend upgrading to golang:1.21rc3, as this image has only 69 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	Exposure of Resource to Wrong Sphere SNYK-DEBIAN11-CURL-3065656	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN11-GIT-3232722	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN11-GIT-3232724	No Known Exploit
	614	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-DEBIAN11-OPENSSL-3314584	No Known Exploit
	614	Use After Free SNYK-DEBIAN11-OPENSSL-3314604	No Known Exploit

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