[Snyk] Security upgrade golang from 1.21-alpine to 1.25.4-alpine

[tyvsmith]

Snyk has created this PR to fix 4 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):

• k8s/docker/Dockerfile

We recommend upgrading to golang:1.25.4-alpine, 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
	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE320-OPENSSL-7895537	177
	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE320-OPENSSL-7895537	177
	CVE-2025-9231 SNYK-ALPINE320-OPENSSL-13174135	54
	CVE-2025-9232 SNYK-ALPINE320-OPENSSL-13174136	54
	CVE-2024-13176 SNYK-ALPINE320-OPENSSL-8690013	54

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• 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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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Access of Resource Using Incompatible Type ('Type Confusion')