Pie Chart Labels are broken

It looks like that the labels are broken with Pie Chart labels in the latest ChartJs

```
chartjs-plugin-datalabels.esm.js:118 Uncaught TypeError: Cannot read properties of null (reading 'x')
at orient (chartjs-plugin-datalabels.esm.js:118:19)
at Object.fallback [as positioner] (chartjs-plugin-datalabels.esm.js:342:13)
at coordinates (chartjs-plugin-datalabels.esm.js:838:21)
at Object.draw (chartjs-plugin-datalabels.esm.js:1009:18)
at Object.afterDatasetsDraw (chartjs-plugin-datalabels.esm.js:1302:12)
at callback (helpers.core.ts:109:15)
at PluginService._notify (core.plugins.js:60:11)
at PluginService.notify (core.plugins.js:42:25)
at Chart.notifyPlugins (core.controller.js:1148:26)
at Chart._drawDatasets (core.controller.js:787:10)
```

_Originally posted by @tedik123 in https://github.com/chartjs/chartjs-plugin-datalabels/issues/380#issuecomment-1631647819_

There is a PR #380 which looks like it fixes this problem, according to the PR it is an issue where `instanceof` no longer works in newer versions of ChartJs