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

Updates #18682

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

ipn/ipnlocal/netstack.go

@@ -11,7 +11,6 @@ import (
 	"time"
 
 	"gvisor.dev/gvisor/pkg/tcpip"
-	"tailscale.com/types/ptr"
 )
 
 // TCPHandlerForDst returns a TCP handler for connections to dst, or nil if
@@ -52,7 +51,7 @@ func (b *LocalBackend) TCPHandlerForDst(src, dst netip.AddrPort) (handler func(c
 		// tell the difference between a long lived connection that is idle
 		// vs a connection that is dead because the peer has gone away.
 		// We pick 72h as that is typically sufficient for a long weekend.
-		opts = append(opts, ptr.To(tcpip.KeepaliveIdleOption(72*time.Hour)))
+		opts = append(opts, new(tcpip.KeepaliveIdleOption(72*time.Hour)))
 		return b.handleSSHConn, opts
 	}
 	// TODO(will,sonia): allow customizing web client port ?