fix: declare endpoints output as sensitive

[henworth]

Description

In Terraform version 0.14 and above, module outputs with sensitive keys need to be marked as sensitive. Currently, this module will error out with this message:

│ Error: Output refers to sensitive values
│
│   on outputs.tf line 84:
│   84: output "endpoints" {
│
│ 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
╵

Motivation and Context

Allows apply to complete on Terraform 0.14 and above.

How Has This Been Tested?

Initially observed a Terraform apply fail with the above error message. Once this change was made, the apply was allowed to complete.

Screenshots (if appropriate):

[bryantbiggs]

🎉 This PR is included in version 1.0.5 🎉

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[github-actions]

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