Due to an issue with Polkadot runtime 1'000'000 (seen after the equivalent runtime upgrade on Kusama), I am proposing this Referendum to cancel  Referendum 241 proposing to upgrade Polkadot to it.

Details: https://twitter.com/XiliangChen/status/1722546330382565572

Cancel an ongoing referendum.

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

Emits `Cancelled`.

- Problem Statement: The issue lies with Polkadot runtime 1'000'000, which was observed after a similar upgrade on Kusama, affecting the intended audience of Polkadot users and developers.
- Significance: The problem is significant as it disrupts the functionality of the Polkadot network, potentially impacting its user base and overall performance.
- Proposed Solution: The proposed solution is to cancel Referendum 241, which proposes to upgrade Polkadot to the problematic runtime.
- Expected Outcomes: The cancellation of the referendum is expected to prevent the implementation of the problematic runtime, thereby maintaining the stability and functionality of the Polkadot network.

#246 Cancel Referendum 241 (runtime upgrade) due to XCM issue