Crashes during init on Android API 23 and below

### Environment

Android API level 23 and below

### Steps to Reproduce

1. Use an Android simulator with API level 23 or below in the sample project
### Log
https://sentry-sdks.sentry.io/issues/4026916773/?project=5903800&query=is%3Aunresolved&referrer=issue-stream

```
AbstractMethodError
abstract method "boolean io.sentry.util.thread.IMainThreadChecker.isMainThread()"
```
