Bump GKE version.
Bump GKE version.

Tests were failing with an invalid version error, so bumping the version
like this should fix the tests.

hashicorp/terraform-provider-google-beta,terraform-providers/terraform-provider-google,hashicorp/terraform-provider-google-beta,ubschmidt2/terraform-provider-google,hashicorp/terraform-provider-google,rosbo/terraform-provider-google,drebes/terraform-provider-google,rosbo/terraform-provider-google,terraform-providers/terraform-provider-google,ubschmidt2/terraform-provider-google,hashicorp/terraform-provider-google-beta,hashicorp/terraform-provider-google,drebes/terraform-provider-google,terraform-providers/terraform-provider-google,drebes/terraform-provider-google,hashicorp/terraform-provider-google-beta,ubschmidt2/terraform-provider-google,rosbo/terraform-provider-google,hashicorp/terraform-provider-google,terraform-providers/terraform-provider-google,hashicorp/terraform-provider-google,terraform-providers/terraform-provider-google,rosbo/terraform-provider-google,ubschmidt2/terraform-provider-google,drebes/terraform-provider-google