google-maps: map doesn't render on iphone

## Bug Report

### Plugin(s)
```
"@capacitor/google-maps": "^5.4.1"
```

### Capacitor Version

```
💊 Capacitor Doctor 💊

Latest Dependencies:

@capacitor/cli: 6.0.0
@capacitor/core: 6.0.0
@capacitor/android: 6.0.0
@capacitor/ios: 6.0.0

Installed Dependencies:

@capacitor/android: not installed
@capacitor/cli: 5.0.4
@capacitor/ios: 5.0.4
@capacitor/core: 5.7.0
```

### Platform(s)
IOS
- IOS 15, Iphone SE (1) Emulator
- IOS 14, Iphone SE (1) real device

### Current Behavior
The app doesn't crash but only a white map is created. There is no google maps logo visible and otherwise there are no further error logs.

### Expected Behavior
Map should render.

### Code Reproduction
[code.zip](https://github.com/ionic-team/capacitor-plugins/files/15447670/code.zip)

- ionic cap add ios
- npm install
- add google API key to google-maps component file src/app/core/map/components/google-map/google-map.component.ts
- ionic capacitor build ios
- open xcode
- download ios 15
- create emulator SE(1) with IOS 15
- run app
or

- run against an older iphone

### Other Technical Details

### Additional Context
Maybe this is a similar issue to this one: https://github.com/ionic-team/capacitor-plugins/issues/1319 or this one: https://github.com/ionic-team/capacitor-plugins/issues/980