The Moonbeam Foundation is proposing to cancel referenda 95, preventing the authorization to upgrade Moonriver to runtime 4201 due to a critical issue that has been identified.

Please see the [forum post](https://forum.moonbeam.network/t/mr-96-cancel-referendum-95-authorize-runtime-upgrade-to-4201/2422) for more details.

Cancel an ongoing referendum.

- `origin`: must be the `CancelOrigin`.
- `index`: The index of the referendum to be cancelled.

Emits `Cancelled`.

#96 Cancel Referendum 95 (authorize runtime upgrade to 4201)