Update dependencies

vendor/tailscale.com/wgengine/magicsock/peermtu_linux.go

@@ -0,0 +1,49 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build linux && !android
+
+package magicsock
+
+import (
+	"syscall"
+)
+
+func getDontFragOpt(network string) int {
+	if network == "udp4" {
+		return syscall.IP_MTU_DISCOVER
+	}
+	return syscall.IPV6_MTU_DISCOVER
+}
+
+func (c *Conn) setDontFragment(network string, enable bool) error {
+	optArg := syscall.IP_PMTUDISC_DO
+	if enable == false {
+		optArg = syscall.IP_PMTUDISC_DONT
+	}
+	var err error
+	rcErr := c.connControl(network, func(fd uintptr) {
+		err = syscall.SetsockoptInt(int(fd), getIPProto(network), getDontFragOpt(network), optArg)
+	})
+
+	if rcErr != nil {
+		return rcErr
+	}
+	return err
+}
+
+func (c *Conn) getDontFragment(network string) (bool, error) {
+	var v int
+	var err error
+	rcErr := c.connControl(network, func(fd uintptr) {
+		v, err = syscall.GetsockoptInt(int(fd), getIPProto(network), getDontFragOpt(network))
+	})
+
+	if rcErr != nil {
+		return false, rcErr
+	}
+	if v == syscall.IP_PMTUDISC_DO {
+		return true, err
+	}
+	return false, err
+}