Accept header for Retrieve a schema call doesn't work

### Expected Behaviour
Call should be made successfully with the included accept header

### Actual Behaviour
The current included accept header for the Retrieve a schema call is "application/vnd.adobe.xed-id+json"
When making a call with this header, the response is:
{
"type": "http://ns.adobe.com/aep/errors/XDM-1007-400",
"title": "Accept header invalid",
"status": 400,
"report": {
"registryRequestId": "d3c91881-5726-4c3a-aae1-a28ecb1a6b9d",
"timestamp": "06-24-2022 04:12:19",
"detailed-message": "The supplied Accept header is not valid: application/vnd.adobe.xed-id+json - A valid Accept value should look like application/vnd.adobe.'{xed|xdm'}+json; version=1 (Version should be specified)",
"sub-errors": []
},
"detail": "The supplied Accept header is not valid: application/vnd.adobe.xed-id+json - A valid Accept value should look like application/vnd.adobe.'{xed|xdm'}+json; version=1 (Version should be specified)"
}

I was able to get a good response by updating the Accept header to:
application/vnd.adobe.xed+json; version=1

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce
Download the Schema Registry API collection.
Make a call using "Retrieve a schema" and the included Accept header

#### Platform and Version

#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

Download the Schema Registry API collection and open the "Retrieve a schema" request. Compare its included Accept header with the valid value shown in the issue, update the request so the call succeeds, and verify that the response no longer reports an invalid Accept header.

Written by the indexing model from the issue text.