Bump Kubernetes version default: v1.31.3 and latest: v1.32.0-rc.0

[minikube-bot]

This PR was auto-generated by make update-kubernetes-version using update-k8s-versions.yml CI Workflow.
Please only merge if all the tests pass.

 M pkg/minikube/constants/constants.go
 M site/content/en/docs/commands/start.md
?? pkg/minikube/bootstrapper/bsutil/testdata/v1.32/

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @minikube-bot. Thanks for your PR.

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