Upgrade TwilioVideo in Android to 7.3.1 (#632)
Upgrade TwilioVideo in Android to 7.3.1 (#632)

* Upgrade TwilioVideo in Android to 7.3.1

> Support for 6.x will cease on September 17th, 2022. This branch will only receive fixes for critical issues until that date.

## Migration Docs
Link: https://www.twilio.com/docs/video/migrating-6x-7x

So far nothing important:
- the inclusion of `frames_encoded` in the returned data is not included in this PR
- I don't think the ordering of `onAudioTrackSubscribed` and `onVideoTrackSubscribed` ever mattered?


## Changes:
- Minimum SDK will now be 21 instead of 16
  - Update also bumped Google WebRTC to 1.0.32006 from 1.0.30039


# Tests

I have so far tested this with web-windows (I'll find time to test calls between ios and android):
```
Web:
- Windows 11 HSL 21H2 22000.918
- Google Chrome Version 105.0.5195.102 (Official Build) (64-bit)


Androids:
[1]: Huawei Y7a (PPA-LX2) EMUI 10.1.1 Android 10
[2]: Galaxy A71 (SM-A715F/DS) One UI 4.1 Android 12
[3]: Huawei nova 3i (INE-LX2) EMUI 9.1.1 Android 9
[4]: vivo Y85A Funtouch OS_4.0 Android 8.1.0

```


If anyone can double check, that would be greatly appreciated

* Update build.gradle

Bad value provided for DEFAULT_COMPILE_SDK_VERSION (39 -> 30)
blackuy/react-native-twilio-video-webrtc,blackuy/react-native-twilio-video-webrtc,blackuy/react-native-twilio-video-webrtc