Synchronize new proto changes.

gapic/packaging/dependencies.yaml

@@ -26,6 +26,8 @@ auth_version:
     lower: '0.5.1'
 
 grpc_version:
+  csharp:
+    lower: '1.6.1'
   python:
     lower: '1.0.2'
     upper: '2.0dev'
@@ -52,6 +54,8 @@ gax_version:
     lower: '1.8.1'
 
 gax_grpc_version:
+  csharp:
+    lower: '2.1.0'
   java:
     lower: '0.25.1'
 
@@ -87,6 +91,9 @@ google-common-protos_version:
     lower: '0.1.20'
 
 google-iam-v1_version:
+  csharp:
+    name_override: Google.Cloud.Iam.V1
+    lower: '1.0.0-beta12'
   python:
     name_override: grpc-google-iam-v1
     lower: '0.11.1'