test remove security schema for sandbox

Author: nhsd-david-wass

sandbox/api/openapi.yaml

@@ -12,8 +12,6 @@ servers:
   url: http://127.0.0.1:3000
 - description: Public sandbox
   url: https://sandbox-server.nhs.uk/nhs-notify-supplier-api
-security:
-- app-level0: []
 tags:
 - description: ""
   name: letter
@@ -1209,22 +1207,6 @@ components:
           type: number
       type: object
   securitySchemes:
-    nhs-login-p0:
-      description: |
-        # NHS Login P0 authentication
-
-        This is a user-restricted authentication pattern for Patient Access to
-        NHS Digital APIs.  For a full description of our authentication and
-        authorization patterns please see the [Security and authorisation page](https://digital.nhs.uk/developer/guides-and-documentation/security-and-authorisation).
-      flows:
-        authorizationCode:
-          authorizationUrl: /oauth2/authorize
-          scopes: {}
-          tokenUrl: /oauth2/token
-        x-tokenExchange:
-          tokenUrl: /oauth2/token
-          scopes: {}
-      type: oauth2
     app-level0:
       description: |
         # Application level 0 authentication