For Azure: "application_id" has been depreciated in favour of "client_id"

For Azure: "application_id" has been depreciated in favour of "client_id"

In main.tf, replace line 60 with:
```
      "AZURE_CLIENT_ID"             = azuread_service_principal.app.client_id
```

In service_principal.tf, replace line 9 with:
```
  client_id               = azuread_application.app.client_id
```