The labelStyle parameter is not being applied

It appears that the labelStyle parameter is not being applied.
According to the documentation, the labelStyle parameter is supposed to allow you to specify custom styles for the label. However, when I try to use this parameter, it does not seem to have any effect on the appearance of the label.
I have tried passing various values for the labelStyle parameter, but none of them seem to make a difference. The label text always appears with the default style, regardless of what I specify for labelStyle.
I believe this is a bug in the package, as the labelStyle parameter is documented as a valid option but does not appear to be working correctly. It would be great if this could be fixed so that users can take advantage of the full range of customization options available.

#### Steps to reproduce

1. Use the `googlemaps/js-markerwithlabel` package to add a marker to a Google Map.
2. Specify the `labelStyle` parameter with custom styles for the label.
3. Observe that the label appears with the default style, ignoring the styles specified in `labelStyle`.

#### Code example

```js
import { MarkerWithLabel } from '@googlemaps/markerwithlabel';

new MarkerWithLabel({
position: new google.maps.LatLng(49.475, -123.84),
clickable: true,
draggable: true,
map: map,
labelContent: "foo", // can also be HTMLElement
labelAnchor: new google.maps.Point(-21, 3),
labelClass: "labels", // the CSS class for the label
labelStyle: { opacity: 1.0, color: "red" }, // <- this seems to be ignored
})
```

#### Expected behavior:

The label should appear with the styles specified in the `labelStyle` parameter.

#### Actual behavior:

The label appears with the default style, ignoring the styles specified in `labelStyle`.

#### Affected version:

The issue appears to be present in the latest version (and seemingly all previous versions) of the package as of this writing (v2.0.21). I actually cannot find any reference in any of the code to `labelStyle` in the git history.