Fix compute-vm:CloudKMS test for provider>=4.54.0

* TF provider >= 4.54.0 now returns `rsa_encrypted_key` for
  `google_compute_disk.disks["attached-disk"]` (see
  hashicorp/terraform-provider-google#4448)
* Add this field to expected model to fix test assertion failure
* Update required TF provider to 4.55.0 (latest) since the assertion
  will now fail with <4.54.0, which do not return `rsa_encrypted_key`
  * Updated the whole repo on advice from @ludoo

modules/bigtable-instance/versions.tf

@@ -17,11 +17,11 @@ terraform {
   required_providers {
     google = {
       source  = "hashicorp/google"
-      version = ">= 4.50.0" # tftest
+      version = ">= 4.55.0" # tftest
     }
     google-beta = {
       source  = "hashicorp/google-beta"
-      version = ">= 4.50.0" # tftest
+      version = ">= 4.55.0" # tftest
     }
   }
 }