update_kubernetes_version: update regexes and paths

[taciomcosta]

This fix the script hack/kubernetes_version/update_kubernetes_version.go
mentioned by @tstromberg in #4392

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: taciomcosta
To complete the pull request process, please assign medyagh
You can assign the PR to them by writing /assign @medyagh in a comment when ready.

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[minikube-bot]

Can one of the admins verify this patch?

[taciomcosta]

/assign @medyagh

[tstromberg]

/ok-to-test

[tstromberg]

Thank you!

[minikube-pr-bot]

Error: running mkcmp: exit status 1