[Snyk] Security upgrade alpine from 3.20 to 3.21.0

[khanhtc1202]

Snyk has created this PR to fix 1 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• cmd/helloworld/Dockerfile

We recommend upgrading to alpine:3.21.0, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	CVE-2024-9143 SNYK-ALPINE320-OPENSSL-8235201	364
	CVE-2024-9143 SNYK-ALPINE320-OPENSSL-8235201	364

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• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.73%. Comparing base (e276b89) to head (8fb6d00).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5408      +/-   ##
==========================================
- Coverage   25.74%   25.73%   -0.02%     
==========================================
  Files         449      449              
  Lines       48452    48452              
==========================================
- Hits        12474    12468       -6     
- Misses      35005    35011       +6     
  Partials      973      973              

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