[Snyk] Security upgrade golang from 1.21rc3-alpine to 1.21.0-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:1.21.0-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
	514	Improper Authentication SNYK-ALPINE318-OPENSSL-5776808	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
	514	Inefficient Regular Expression Complexity SNYK-ALPINE318-OPENSSL-5788370	No Known Exploit
	514	Excessive Iteration SNYK-ALPINE318-OPENSSL-5821142	No Known Exploit

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[codecov]

Codecov Report

Merging #4 (8765c15) into main (878dd4a) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
- Coverage   49.04%   49.02%   -0.02%     
==========================================
  Files         112      112              
  Lines       12111    12111              
==========================================
- Hits         5940     5938       -2     
- Misses       5776     5777       +1     
- Partials      395      396       +1     

see 2 files with indirect coverage changes

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