chore: Add log when rapt token is acquired. (#1520)

* chore: Add log when rapt token is acquired.

* chore: Add log when rapt token is acquired.

Author: clundin25

google/oauth2/reauth.py

@@ -274,6 +274,7 @@ def get_rapt_token(
 
     # Get rapt token from reauth API.
     rapt_token = _obtain_rapt(request, access_token, requested_scopes=scopes)
+    sys.stderr.write("Reauthentication successful.\n")
 
     return rapt_token