Switch to latest master of kops

[dims]

the URL we are using seems to have gotten outdated. let's use kops master latest url.

❯ curl https://storage.googleapis.com/kops-ci/bin/latest-ci-updown-green.txt
https://storage.googleapis.com/k8s-staging-kops/kops/releases/1.30.0-beta.2+v1.30.0-beta.1-35-gcd7fba97d5

❯ curl https://storage.googleapis.com/k8s-staging-kops/kops/releases/markers/master/latest-ci-updown-green.txt
https://storage.googleapis.com/k8s-staging-kops/kops/releases/1.30.0-beta.2+v1.30.0-beta.1-110-g5d4d867086

/assign @hakuna-matatah

[k8s-ci-robot]

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[dims]

cc @shizuchanw

[dims]

/release-note-none

[kmala]

/lgtm
/approve

[k8s-ci-robot]

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[hakuna-matatah]

/lgtm