Update

vendor/tailscale.com/feature/condregister/useproxy/doc.go

@@ -0,0 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package useproxy registers support for using proxies
+// if it's not disabled via the ts_omit_useproxy build tag.
+package useproxy

vendor/tailscale.com/feature/condregister/useproxy/useproxy.go

@@ -0,0 +1,8 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build !ts_omit_useproxy
+
+package useproxy
+
+import _ "tailscale.com/feature/useproxy"