Spec files larger than 1MB can't be retrieved from GitHub

[pburls]

Spec files larger than 1MB (like this one) can't be retrieve using the existing approach of using the GitHub Repository Contents API.
The following error message is returned:

org.springframework.web.client.HttpClientErrorException$Forbidden: 403 Forbidden: [{"message":"This API returns blobs up to 1 MB in size. The requested blob is too large to fetch via the API, but you can use the Git Data API to request blobs up to 100 MB in size.","errors":[{"resource":"Blob","field":"data","code":"too_large"}],"documentation_url":"https://docs.github.com/rest/reference/repos#get-repository-content"}]

It is likely that the GitHub Blob API needs to be used instead.