updated iam methods in ads-template

Author: daniel-sanche

gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2

@@ -543,7 +543,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
     {% if opts.add_iam_methods %}
     def set_iam_policy(
         self,
-        request: Optional[iam_policy_pb2.SetIamPolicyRequest] = None,
+        request: Optional[Union[iam_policy_pb2.SetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
         timeout: Union[float, object] = gapic_v1.method.DEFAULT,
@@ -633,6 +633,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         # The request isn't a proto-plus wrapped type,
         # so it must be constructed via keyword expansion.
+        if request is None:
+            request = {}
         if isinstance(request, dict):
             request = iam_policy_pb2.SetIamPolicyRequest(**request)
 
@@ -660,7 +662,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
     def get_iam_policy(
         self,
-        request: Optional[iam_policy_pb2.GetIamPolicyRequest] = None,
+        request: Optional[Union[iam_policy_pb2.GetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
         timeout: Union[float, object] = gapic_v1.method.DEFAULT,
@@ -750,6 +752,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         # The request isn't a proto-plus wrapped type,
         # so it must be constructed via keyword expansion.
+        if request is None:
+            request = {}
         if isinstance(request, dict):
             request = iam_policy_pb2.GetIamPolicyRequest(**request)
 
@@ -777,7 +781,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
     def test_iam_permissions(
         self,
-        request: Optional[iam_policy_pb2.TestIamPermissionsRequest] = None,
+        request: Optional[Union[iam_policy_pb2.TestIamPermissionsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
         timeout: Union[float, object] = gapic_v1.method.DEFAULT,
@@ -806,6 +810,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         # The request isn't a proto-plus wrapped type,
         # so it must be constructed via keyword expansion.
+        if request is None:
+            request = {}
         if isinstance(request, dict):
             request = iam_policy_pb2.TestIamPermissionsRequest(**request)