When rendering text, registering AdventPro overrides any other registered font

## Issue

hi,

I'm having this strange bug where registering [AdventPro](https://fonts.google.com/specimen/Advent+Pro) as a custom font will override any other registered font, even when not referenced at all in the canvas.

The code snippet below produces the following image. This text is using AdventPro, i.e. the wrong font:


Expected output with the right font (after removing `registerFont` for AdventPro):


Note that the order of the `registerFont` calls doesn't matter.

thank you,

## Steps to Reproduce

Download and save [AdventPro-VariableFont_wdth,wght.ttf](https://fonts.google.com/specimen/Advent+Pro) and [ZenTokyoZoo-Regular.ttf](https://fonts.google.com/specimen/Zen+Tokyo+Zoo) in the same directory as the following script. Run the script to generate `output.png`.

```js
const canvas = require('canvas');
const fs = require('fs');

// Font that should be used
canvas.registerFont('./ZenTokyoZoo-Regular.ttf', { family: 'ZenTokyoZoo' });

// Comment the following out to see the expected behaviour
canvas.registerFont('./AdventPro-VariableFont_wdth,wght.ttf', { family: 'AdventPro' });

// Canvas
const cvs = canvas.createCanvas(768, 128);
const ctx = cvs.getContext('2d');

// White background
ctx.fillStyle = '#ffffff';
ctx.beginPath();
ctx.fillRect(0, 0, 768, 128);

// Text
ctx.font = '40px "ZenTokyoZoo"';
ctx.fillStyle = '#000000';
ctx.fillText('Willfull denial until it\'s my turn', 64, 64);

// Save to file
fs.writeFileSync('./output.png', cvs.toBuffer());
```

## Your Environment
* Version of node-canvas (output of `npm list canvas` or `yarn list canvas`): 2.11.2
* Environment (e.g. node 4.2.0 on Mac OS X 10.8): Tested with node v18.17.0, v20.9.0. Ubuntu 20.04.1 LTS
* Neither font is installed on my system