Process HANDLE leak on windows

[xhcoding]

Environment details

• OS: Windows10
• OS version: 21H1 19043
• node-pty version: 0.10.1

Issue description

var os = require('os');
var pty = require('node-pty');

var shell = os.platform() === 'win32' ? 'powershell' : 'bash';


setInterval(() => {

  console.log("spawn new process");
  var ptyProcess = pty.spawn(shell, [], {
    name: 'xterm-color',
    cols: 80,
    rows: 30
  });

  ptyProcess.kill();


}, 5000);

After the above code runs for a few minutes :

[Tyriar]

Should be fixed in #510