Update dependencies

vendor/tailscale.com/envknob/envknob_nottest.go

@@ -0,0 +1,16 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build ts_not_in_tests
+
+package envknob
+
+import "runtime"
+
+func GOOS() string {
+	// When the "ts_not_in_tests" build tag is used, we define this func to just
+	// return a simple constant so callers optimize just as if the knob were not
+	// present. We can then build production/optimized builds with the
+	// "ts_not_in_tests" build tag.
+	return runtime.GOOS
+}