[Snyk] Security upgrade golang from 1.21rc3-alpine to 1.21.3-alpine

[wubin1989]

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

• cmd/testdata/testsvc/Dockerfile

We recommend upgrading to golang:1.21.3-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 Write SNYK-ALPINE318-BUSYBOX-5890990	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE318-BUSYBOX-5890990	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE318-BUSYBOX-5890990	No Known Exploit
	514	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	No Known Exploit
	514	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit

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🦉 Improper Authentication
🦉 Inefficient Regular Expression Complexity