Fix admin_enabled variable type from string to bool in container_registry module

Agent-Logs-Url: https://github.com/localstack/localstack-azure-samples/sessions/f4b9445e-0f95-4086-99a6-d7fc7d8e5026

Co-authored-by: paolosalvatori <1658419+paolosalvatori@users.noreply.github.com>

Author: Copilot

samples/web-app-custom-image/python/terraform/modules/container_registry/variables.tf

@@ -15,7 +15,7 @@ variable "location" {
 
 variable "admin_enabled" {
   description = "(Optional) Specifies whether the admin user is enabled. Defaults to false."
-  type        = string
+  type        = bool
   default     = false
 }