Openzeppelins GovernorUpgradeable contract contains receive(), onERC721Received(), onERC1155Received() and onERC1155BatchReceived() to allow inheriting contracts to receive ETH and tokens. 
However, this allows users to accidentally transfer their ETH/tokens to the governor contracts, which will then remain stuck until they are rescued by governance.
In SecurityCouncilNomineeElectionGovernor, SecurityCouncilMemberRemovalGovernor and SecurityCouncilMemberElectionGovernor, consider overriding these functions and making them revert. This prevents users from accidentally transferring ETH/tokens to the contracts.
