TBR v23proxy: Add missing mojom_types dependency

Change-Id: I468ae82033c4fb24fad427307f4a62b60cdf532f
diff --git a/Makefile b/Makefile
index 335c55c..2504d10 100644
--- a/Makefile
+++ b/Makefile
@@ -138,7 +138,7 @@
 	# See https://github.com/domokit/mojo/issues/386
 	rm -f lib/gen/mojom/$(notdir $@)
 
-gen/go/src/mojom/v23proxy/v23proxy.mojom.go: mojom/mojom/v23proxy.mojom | mojo-env-check
+gen/go/src/mojom/v23proxy/v23proxy.mojom.go: mojom/mojom/v23proxy.mojom mojom/mojo/public/interfaces/bindings/mojom_types.mojom | mojo-env-check
 	$(call MOJOM_GEN,$<,mojom,gen,go)
 	gofmt -w $@