Upgrade Go to 1.25.6 to fix high CVE

[aliyajo]

Upgrade go to 1.25.6 to address CVEs

Resource	Current Version	Fixed Version	Vulnerabilities
go/stdlib	1.25.5	1.25.6	CVE-2025-61726, CVE-2025-61728, CVE-2025-61730

[k8s-ci-robot]

Hi @aliyajo. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aliyajo, DavidXU12345

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[DavidXU12345]

/ok-to-test

[DavidXU12345]

/lgtm