Ghc9 support

[LupusAnay]

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[pr-explainer-bot]

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Changes

1. Migrated to GHC 9.0.2
2. Updated Travis CI configuration to include new GHC versions
3. Added support for aeson-1

Suggestions

Sorry, I can't provide suggestions without specific lines of code to refer to.

Bugs

1. In src/Control/Monad/Twilio.hs, the TwilioException type's Eq instance has been removed, potentially causing issues with equality checks.
2. In src/Twilio/Types/Capability.hs, the KeyMap import is not properly conditionalized for aeson versions below 2.0.0, which could cause build failures.

Improvements

1. In src/Twilio/Types/List.hs, the Key type should be properly conditionalized for aeson versions below 2.0.0 to avoid build failures.
2. In src/Twilio/Types/List.hs, the parseJSONToList function could benefit from better error handling and reporting.

Here's an example of how parseJSONToList could be refactored for better readability:

parseJSONToList :: Value -> Parser a
parseJSONToList o@(Object v) = do
  let plural = getConst (getPlural :: Const Key (a, b))
  maybePagingInformation <- case fromJSON o of
    Success pagingInformation -> return $ Just pagingInformation
    _                         -> return Nothing