feat: update policytroubleshooter for iam dependency

google/cloud/policytroubleshooter/iam/v3/BUILD.bazel

@@ -169,24 +169,28 @@ go_gapic_assembly_pkg(
 load(
     "@com_google_googleapis_imports//:imports.bzl",
     "py_gapic_assembly_pkg",
-    "py_gapic_library",
-    "py_test",
+    "py_import",
+    "py_test"
+)
+
+py_import(
+    name="iam_v2",
+    srcs = [
+        "//google/iam/v2:iam_py_gapic",
+    ],
 )
 
 py_gapic_library(
-    name = "iam_py_gapic",
-    srcs = [":iam_proto"],
-    grpc_service_config = "policytroubleshooter_v3_grpc_service_config.json",
-    rest_numeric_enums = True,
     service_yaml = "policytroubleshooter_v3.yaml",
     transport = "grpc+rest",
     deps = [
+        ":iam_v2",
         "//google/iam/v1:iam_policy_py_proto",
-        "//google/iam/v2:iam_policy_py_proto",
     ],
     opt_args = [
         "python-gapic-namespace=google.cloud",
         "python-gapic-name=policytroubleshooter_iam",
+        "proto-plus-deps=google.iam.v2"
     ],
 )