Bump toolset of images/k8s-infra
Bump toolset of images/k8s-infra

https://github.com/cli/cli/releases/tag/v1.12.1
https://github.com/warrensbox/terraform-switcher/tags
https://cloud.google.com/sdk/docs/release-notes#34700_2021-06-29

kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io