Update dependencies

vendor/tailscale.com/net/netmon/polling.go

@@ -0,0 +1,86 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build !windows && !darwin
+
+package netmon
+
+import (
+	"bytes"
+	"errors"
+	"os"
+	"runtime"
+	"sync"
+	"time"
+
+	"tailscale.com/types/logger"
+)
+
+func newPollingMon(logf logger.Logf, m *Monitor) (osMon, error) {
+	return &pollingMon{
+		logf: logf,
+		m:    m,
+		stop: make(chan struct{}),
+	}, nil
+}
+
+// pollingMon is a bad but portable implementation of the link monitor
+// that works by polling the interface state every 10 seconds, in lieu
+// of anything to subscribe to.
+type pollingMon struct {
+	logf logger.Logf
+	m    *Monitor
+
+	closeOnce sync.Once
+	stop      chan struct{}
+}
+
+func (pm *pollingMon) IsInterestingInterface(iface string) bool {
+	return true
+}
+
+func (pm *pollingMon) Close() error {
+	pm.closeOnce.Do(func() {
+		close(pm.stop)
+	})
+	return nil
+}
+
+func (pm *pollingMon) isCloudRun() bool {
+	// https: //cloud.google.com/run/docs/reference/container-contract#env-vars
+	if os.Getenv("K_REVISION") == "" || os.Getenv("K_CONFIGURATION") == "" ||
+		os.Getenv("K_SERVICE") == "" || os.Getenv("PORT") == "" {
+		return false
+	}
+	vers, err := os.ReadFile("/proc/version")
+	if err != nil {
+		pm.logf("Failed to read /proc/version: %v", err)
+		return false
+	}
+	return string(bytes.TrimSpace(vers)) == "Linux version 4.4.0 #1 SMP Sun Jan 10 15:06:54 PST 2016"
+}
+
+func (pm *pollingMon) Receive() (message, error) {
+	d := 10 * time.Second
+	if runtime.GOOS == "android" {
+		// We'll have Android notify the link monitor to wake up earlier,
+		// so this can go very slowly there, to save battery.
+		// https://github.com/tailscale/tailscale/issues/1427
+		d = 10 * time.Minute
+	} else if pm.isCloudRun() {
+		// Cloud Run routes never change at runtime. the containers are killed within
+		// 15 minutes by default, set the interval long enough to be effectively infinite.
+		pm.logf("monitor polling: Cloud Run detected, reduce polling interval to 24h")
+		d = 24 * time.Hour
+	}
+	timer := time.NewTimer(d)
+	defer timer.Stop()
+	for {
+		select {
+		case <-timer.C:
+			return unspecifiedMessage{}, nil
+		case <-pm.stop:
+			return nil, errors.New("stopped")
+		}
+	}
+}