This upgrades Polkadot to v1.2.4: https://github.com/polkadot-fellows/runtimes/releases/tag/v1.2.4

Enactment is set for [Tuesday, 11 June](https://polkadot.subscan.io/block/21169000).

See [`Pallet::dispatch_whitelisted_call_with_preimage`].

- **Problem Statement:** Polkadot needs an upgrade to version 1.2.4.
- **Significance:** Ensuring Polkadot's system is up-to-date and efficient.
- **Proposed Solution:** Upgrade Polkadot to version 1.2.4.
- **Expected Outcomes:** Improved performance and functionality for Polkadot users.

#791 [Whitelisted Caller] Upgrade Polkadot v1.2.4

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