types/ptr: deprecate ptr.To, use Go 1.26 new

Updates #18682

Change-Id: I62f6aa0de2a15ef8c1435032c6aa74a181c25f8f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

ipn/ipnserver/server_test.go

@@ -16,7 +16,6 @@ import (
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/lapitest"
 	"tailscale.com/tsd"
-	"tailscale.com/types/ptr"
 	"tailscale.com/util/syspolicy/pkey"
 	"tailscale.com/util/syspolicy/policytest"
 )
@@ -49,7 +48,7 @@ func TestUserConnectDisconnectNonWindows(t *testing.T) {
 
 	// And if we send a notification, both users should receive it.
 	wantErrMessage := "test error"
-	testNotify := ipn.Notify{ErrMessage: ptr.To(wantErrMessage)}
+	testNotify := ipn.Notify{ErrMessage: new(wantErrMessage)}
 	server.Backend().DebugNotify(testNotify)
 
 	if n, err := watcherA.Next(); err != nil {
@@ -274,12 +273,12 @@ func TestShutdownViaLocalAPI(t *testing.T) {
 		},
 		{
 			name:                   "AllowTailscaledRestart/False",
-			allowTailscaledRestart: ptr.To(false),
+			allowTailscaledRestart: new(false),
 			wantErr:                errAccessDeniedByPolicy,
 		},
 		{
 			name:                   "AllowTailscaledRestart/True",
-			allowTailscaledRestart: ptr.To(true),
+			allowTailscaledRestart: new(true),
 			wantErr:                nil, // shutdown should be allowed
 		},
 	}