fix(id_token): change spelling of _API_GATEWAY_SERVICE_ACCOUNTS

Rename the variable to _DEFAULT_EXPECTED_AUTHORISED_PARTIES which better
reflects its actual meaning.

apigatewayauth/id_token.py

@@ -31,7 +31,7 @@ def _default_caching_request() -> Request:
 _DEFAULT_CACHING_REQUEST = _default_caching_request()
 
 # List of Google service accounts which represent the API gateway identity.
-_API_GATEWAY_SERVICE_ACCOUNTS = ["api-gateway@api-meta-2555105a.iam.gserviceaccount.com"]
+_DEFAULT_EXPECTED_AUTHORISED_PARTIES = ["api-gateway@api-meta-2555105a.iam.gserviceaccount.com"]
 
 # Default URL used to fetch certificates corresponding to JWT signing keys
 _DEFAULT_CERTS_URL = "https://www.googleapis.com/oauth2/v1/certs"
@@ -80,7 +80,7 @@ def verify_id_token_for_api_backend(
     expected_authorised_parties = (
         set(expected_authorised_parties)
         if expected_authorised_parties is not None
-        else _API_GATEWAY_SERVICE_ACCOUNTS
+        else _DEFAULT_EXPECTED_AUTHORISED_PARTIES
     )
     certs_url = certs_url if certs_url is not None else _DEFAULT_CERTS_URL
     trusted_issuers = (