Upgrades Polkadot Bridge Hub Runtime to 1.4.3. View [changelog](https://github.com/polkadot-fellows/runtimes/releases/tag/v1.4.3).&#x20;

This upgrade is crucial to have Snowbridge ready for the Electra fork on 7 May.

Fellowship whitelist proposal: https://collectives.subsquare.io/fellowship/referenda/327

- Problem Statement: Upgrading Polkadot Bridge Hub Runtime to 1.4.3 for Snowbridge readiness by the Electra fork on 7 May.
- Significance: Ensures compatibility and functionality for the upcoming Electra fork.
- Proposed Solution: Upgrade Polkadot Bridge Hub Runtime to version 1.4.3.
- Expected Outcomes: Smooth transition for Snowbridge readiness and Electra fork compatibility.

#1528 [Runtime 1.4.3] Upgrade Polkadot Bridge Hub

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