rename deprecated enable_rbac_authorization attribute

[a-mnich]

Rename enable_rbac_authorization to rbac_authorization_enabled due to deprecation.

╷
│ Warning: Argument is deprecated
│
│   with module.scepman.azurerm_key_vault.vault,
│   on .terraform\modules\scepman\keyvault.tf line 10, in resource "azurerm_key_vault" "vault":
│   10:   enable_rbac_authorization = var.key_vault_use_rbac
│
│ This property has been renamed to `rbac_authorization_enabled` and will be removed in v5.0 of the provider
╵
╷
│ Warning: Deprecated attribute
│
│   on .terraform\modules\scepman\keyvault.tf line 35, in resource "azurerm_key_vault_access_policy" "scepman":
│   35:   count = azurerm_key_vault.vault.enable_rbac_authorization ? 0 : 1
│
│ The attribute "enable_rbac_authorization" is deprecated. Refer to the provider documentation for details.
│
│ (and 3 more similar warnings elsewhere)
╵

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/key_vault#rbac_authorization_enabled-1

[a-mnich]

already implemented in #27