Update

vendor/tailscale.com/appc/observe_disabled.go

@@ -0,0 +1,8 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build ts_omit_appconnectors
+
+package appc
+
+func (e *AppConnector) ObserveDNSResponse(res []byte) error { return nil }