importer-rest-api-specs - fix aks test template

[ms-henglu]

To fix the following tests:

=== RUN   TestAccKubernetesClusterTrustedAccessRoleBinding_basic
=== PAUSE TestAccKubernetesClusterTrustedAccessRoleBinding_basic
=== CONT  TestAccKubernetesClusterTrustedAccessRoleBinding_basic
    testcase.go:113: Step 1/2 error: Error running pre-apply refresh: exit status 1
        Error: Unsupported block type
          on terraform_plugin_test.tf line 79, in resource "azurerm_kubernetes_cluster" "test":
          79:   upgrade_settings {
        Blocks of type "upgrade_settings" are not expected here.
--- FAIL: TestAccKubernetesClusterTrustedAccessRoleBinding_basic (3.63s)
FAIL

[stephybun]

Thanks @ms-henglu LGTM 👍