breakfix nil VpcOptions (#3160)

Author: lucix-aws

.changelog/842971710ea14a5aad4add0ee0ffef23.json

@@ -0,0 +1,8 @@
+{
+    "id": "84297171-0ea1-4a5a-ad4a-dd0ee0ffef23",
+    "type": "bugfix",
+    "description": "**BREAKING CHANGE**: The fields on VpcOptions have been changed from `bool` to `*bool`. Before this change, the fields were incorrectly marked as having default values of false by the service, which made it functionally impossible for users to set them false in an API call.",
+    "modules": [
+        "service/networkmanager"
+    ]
+}

codegen/smithy-aws-go-codegen/src/main/java/software/amazon/smithy/aws/go/codegen/customization/RemoveDefaults.java

@@ -40,7 +40,13 @@ public class RemoveDefaults implements GoIntegration {
         serviceToShapeIds("com.amazonaws.dataexchange#DataExchange",
                     // https://github.com/aws/aws-sdk-go-v2/issues/3066
                     // we need to target synthetic shapes since we generate synthetic input shapes
-                    "smithy.go.synthetic#UpdateRevisionInput$Finalized")
+                    "smithy.go.synthetic#UpdateRevisionInput$Finalized"),
+        serviceToShapeIds("com.amazonaws.networkmanager#NetworkManager",
+                    // https://github.com/aws/aws-sdk-go-v2/issues/3158
+                    "com.amazonaws.networkmanager#VpcOptions$Ipv6Support",
+                    "com.amazonaws.networkmanager#VpcOptions$ApplianceModeSupport",
+                    "com.amazonaws.networkmanager#VpcOptions$DnsSupport",
+                    "com.amazonaws.networkmanager#VpcOptions$SecurityGroupReferencingSupport")
     );
 
     private boolean mustPreprocess(ShapeId service) {