Update Golang to 1.25.9

[ameukam]

https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU

written with the help of Sonnet 4.5

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rifelpet

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[k8s-ci-robot]

@ameukam: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-kubernetes-e2e-ubuntu-gce-build	2357413	link	false	/test pull-kops-kubernetes-e2e-ubuntu-gce-build

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[hakman]

/retest