fix: adding default parameters to updated interfaces (#1622)

* fix: adding default parameters to updated interfaces

* fix: adding default UD parameter to client

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---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: Timur Sadykov

google/auth/impersonated_credentials.py

@@ -46,7 +46,12 @@
 
 
 def _make_iam_token_request(
-    request, principal, headers, body, universe_domain, iam_endpoint_override=None
+    request,
+    principal,
+    headers,
+    body,
+    universe_domain=credentials.DEFAULT_UNIVERSE_DOMAIN,
+    iam_endpoint_override=None,
 ):
     """Makes a request to the Google Cloud IAM service for an access token.
     Args:

google/oauth2/_client.py

@@ -325,7 +325,7 @@ def call_iam_generate_id_token_endpoint(
     signer_email,
     audience,
     access_token,
-    universe_domain,
+    universe_domain=credentials.DEFAULT_UNIVERSE_DOMAIN,
 ):
     """Call iam.generateIdToken endpoint to get ID token.