node-canvas can't read some letters in directories like this './data/yoü'

## Issue or Feature

## Steps to Reproduce

```js
var Canvas = require('canvas');
var canvas = Canvas.createCanvas(200, 200);
var ctx = canvas.getContext('2d');

const ifade = await Canvas.loadImage('./data/diyalog/yüzler/'+args[2]+'/'+args[3])
ctx.drawImage(ifade, 0, 0);
```

## Your Environment
* Version of node-canvas 2.8.0
* Node v14.17.0 on Windows 10