Update dependencies

vendor/github.com/tailscale/golang-x-crypto/internal/poly1305/mac_noasm.go

@@ -0,0 +1,9 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (!amd64 && !ppc64le && !s390x) || !gc || purego
+
+package poly1305
+
+type mac struct{ macGeneric }