Bump Golang version to v1.25.0

[RainbowMango]

This PR bumps Golang to v1.25.0 as it is necessary before bumping Kubernetes v1.35.
See #224 (comment) for reference.

[k8s-ci-robot]

This issue is currently awaiting triage.

If custom-metrics-apiserver contributors determine this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [RainbowMango]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[Copilot]

Pull request overview

This PR updates the Go language version from 1.24.0 to 1.25.0 and the toolchain from go1.24.4 to go1.25.5. This upgrade is stated as a prerequisite for bumping Kubernetes dependencies to v1.35, as referenced in the related PR #224 for updating k8s-dependencies.

Key Changes:

• Go version bumped from 1.24.0 to 1.25.0
• Toolchain version bumped from go1.24.4 to go1.25.5

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[RainbowMango]

/retest

[RainbowMango]

Error: can't load config: the Go language version (go1.24) used to build golangci-lint is lower than the targeted Go version (1.25.5)
Failed executing command with error: can't load config: the Go language version (go1.24) used to build golangci-lint is lower than the targeted Go version (1.25.5)
Run "make update-lint"
make: *** [Makefile:60: verify-lint] Error 1

Will fix this later.