fix[authentication]: fix a typo in scope key

[ArnavKaushik]

Updated the spelling of scope for the authentication request.

Description

There is a typo in the auth.go file that leads to malformed requests with a specified client scope. This PR resolves the issue by updating the spelling of the request key.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Running existing tests

This was tested by running a series of requests in Postman to ensure the original spelling was incorrect, and then the library was recompiled to ensure the typo was resolved.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have rebased my branch to include the latest changes from master

[ArnavKaushik]

I've updated the PR to accommodate for the now merged PR #6.

[kha7iq]

Thank you @ArnavKaushik for the contribution.