MarkerClusterer.renderer is not supporting multiple AdvancedMarkerElement, still use deprecated Marker

I am using the: "@googlemaps/markerclusterer": "^2.5.3"

I have encountered the following issues:

I am trying to render `AdvancedMarkerElement` within the `MarkerClusterer` initialization phase, but I don't want to use the `Marker` class because this has become deprecated.

```
const config = {
map: this.map,
markers: this.markers,
algorithm: new SuperClusterAlgorithm({radius: 16, zoom: 8}),
renderer: {
render: ({ count, position }) =>
new AdvancedMarkerElement({
title: String(count),
position: position,
content: customContent
})
}
}

new MarkerClusterer(config);
```

The issue is within the `AdvancedMarkerElement.content`, as it is written in the property's comment:

`
The DOM Element backing the visual of an AdvancedMarkerElement.
Note: AdvancedMarkerElement does not clone the passed-in DOM element. Once the DOM element is passed to an AdvancedMarkerElement, passing the same DOM element to another AdvancedMarkerElement will move the DOM element and cause the previous AdvancedMarkerElement to look empty.
`

This leads to a rendering issue, where I can only render one custom `AdvancedMarkerElement`. I also don't want to use the old `Marker`, but there are no alternatives at the moment, so I have to use a deprecated method.

Please consider supporting multiple `AdvancedMarkerElement` (some way) within the `MarkerClusterer` or comment me a workaround!

Thank you!