[location][android] Downgrade play-services-location to 20.0.0 (#23501)

# Why

The latest version of `react-native-maps` (v1.7.1) is not yet compatible
with `play-services-location:21.0.0`. This

[location][android] Downgrade play-services-location to 20.0.0 (#23501)

# Why

The latest version of `react-native-maps` (v1.7.1) is not yet compatible
with `play-services-location:21.0.0`. This incompatibility causes apps
to crash when utilizing `expo-location` along with `react-native-maps`,
especially when the `showUserLocation` prop is enabled.

Closes ENG-9289
Fixes https://github.com/expo/expo/issues/23396

# How

This PR downgrades `play-services-location` to v20.0.0, the same used by
Expo Go. As a side effect, we need to revert
https://github.com/expo/expo/commit/3436d44c0008c2b8049b7611f13ef75818d591b1
as things like `LocationRequest.Builder` were only introduced on v21
([Release
Notes](https://developers.google.com/android/guides/releases?hl=en#october_13_2022))



# Test Plan

Run bare-expo on Android and test `expo-location` and
`react-native-maps` through the "Background Location" screen

# Checklist

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Please check the appropriate items below if they apply to your diff.
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- [ ] Documentation is up to date to reflect these changes (eg:
https://docs.expo.dev and README.md).
- [ ] Conforms with the [Documentation Writing Style
Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
- [ ] This diff will work correctly for `npx expo prebuild` & EAS Build
(eg: updated a module plugin).

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