fix: Make eventbridge connections output sensitive

[Engerim]

Atm with the aws provider this module fails as the event bridge connection output is sensitve but not declared as sensitive in the module

The output fails
╷
│ Error: Output refers to sensitive values
│
│ on outputs.tf line 128:
│ 128: output "eventbridge_connections" {
│
│ To reduce the risk of accidentally exporting sensitive data that was
│ intended to be only internal, Terraform requires that any root module
│ output containing sensitive data be explicitly marked as sensitive, to
│ confirm your intent.
│
│ If you do intend to export this data, annotate the output value as
│ sensitive by adding the following argument:
│ sensitive = true