The call in this referenda updates the `safeXcmVersion` of Polkadot System Parachains to value 3.
Currently set version 2 is outdated and will be deprecated. Setting this to version 3 is required to support new V3 destinations/connections by default.
Note: Polkadot Relay already has this set to 3 so that's why it's not included in the call.
Needs to be whitelisted by: <a href="https://collectives.polkassembly.io/referenda/77">https://collectives.polkassembly.io/referenda/77</a>

See [`Pallet::dispatch_whitelisted_call_with_preimage`].

- **Problem Statement:** Updating the `safeXcmVersion` of Polkadot System Parachains to version 3 to support new V3 destinations/connections.
- **Significance:** Version 2 is outdated and will be deprecated, hindering compatibility with new connections.
- **Proposed Solution:** Whitelisting the update through ReferendumV2.
- **Expected Outcomes:** Enhanced compatibility with new V3 destinations/connections.

#505 Set `safeXcmVersion` to 3 for AssetHub, Collectives and BridgeHub

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