chore: Bump intl 0.19.0 to 0.20.0

[KKimj]

Related Issues

fixes

ERROR: ERROR: ERROR: Because pos_core_dart depends on dart_firebase_admin ^0.4.0 which depends on intl ^0.19.0, intl ^0.19.0 is required.
So, because pos_core_dart depends on intl ^0.20.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Consider downgrading your constraint on intl: dart pub add intl:^0.19.0

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  ## Unreleased fix/major/minor
  
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