[Snyk] Security upgrade alpine from 3.7 to 3.21.3

[tf-security]

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):

• Dockerfile

We recommend upgrading to alpine:3.21.3, 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
	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	241
	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	241

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