fix: fix unit tests so they can work in g3 (#714)

* fix: mock not working well with g3 test

* update

* update
diff --git a/tests/oauth2/test_sts.py b/tests/oauth2/test_sts.py
index 8792bd6..e8e008d 100644
--- a/tests/oauth2/test_sts.py
+++ b/tests/oauth2/test_sts.py
@@ -128,7 +128,7 @@
             self.ADDON_HEADERS,
         )
 
-        self.assert_request_kwargs(request.call_args.kwargs, headers, request_data)
+        self.assert_request_kwargs(request.call_args[1], headers, request_data)
         assert response == self.SUCCESS_RESPONSE
 
     def test_exchange_token_partial_success_without_auth(self):
@@ -157,7 +157,7 @@
             requested_token_type=self.REQUESTED_TOKEN_TYPE,
         )
 
-        self.assert_request_kwargs(request.call_args.kwargs, headers, request_data)
+        self.assert_request_kwargs(request.call_args[1], headers, request_data)
         assert response == self.SUCCESS_RESPONSE
 
     def test_exchange_token_non200_without_auth(self):
@@ -227,7 +227,7 @@
             self.ADDON_HEADERS,
         )
 
-        self.assert_request_kwargs(request.call_args.kwargs, headers, request_data)
+        self.assert_request_kwargs(request.call_args[1], headers, request_data)
         assert response == self.SUCCESS_RESPONSE
 
     def test_exchange_token_partial_success_with_basic_auth(self):
@@ -259,7 +259,7 @@
             requested_token_type=self.REQUESTED_TOKEN_TYPE,
         )
 
-        self.assert_request_kwargs(request.call_args.kwargs, headers, request_data)
+        self.assert_request_kwargs(request.call_args[1], headers, request_data)
         assert response == self.SUCCESS_RESPONSE
 
     def test_exchange_token_non200_with_basic_auth(self):
@@ -331,7 +331,7 @@
             self.ADDON_HEADERS,
         )
 
-        self.assert_request_kwargs(request.call_args.kwargs, headers, request_data)
+        self.assert_request_kwargs(request.call_args[1], headers, request_data)
         assert response == self.SUCCESS_RESPONSE
 
     def test_exchange_token_partial_success_with_reqbody_auth(self):
@@ -362,7 +362,7 @@
             requested_token_type=self.REQUESTED_TOKEN_TYPE,
         )
 
-        self.assert_request_kwargs(request.call_args.kwargs, headers, request_data)
+        self.assert_request_kwargs(request.call_args[1], headers, request_data)
         assert response == self.SUCCESS_RESPONSE
 
     def test_exchange_token_non200_with_reqbody_auth(self):