await proxy.propose(
    [signers[3].address],
    [ethers.utils.parseEther("0.1")],
    [""],
    [ethers.BigNumber.from(0)],
    "Send funds to 3rd signer"
);
await proxy.execute(2);  // this fails
    await proxy.execute(2, {value: ethers.utils.parseEther("0.1")})  // this would work
    0.1 eth will be sent out, but it is sent from the msg.sender not from the timelock contract.
function execute(uint proposalId) external {
    require(state(proposalId) == ProposalState.Queued, "GovernorAlpha::execute: proposal can only be executed if it is queued");
    Proposal storage proposal = proposals[proposalId];
    proposal.executed = true;
    for (uint i = 0; i < proposal.targets.length; i++) {
        timelock.executeTransaction(proposal.targets[i], proposal.values[i], proposal.signatures[i], proposal.calldatas[i], proposal.eta);
    }
    emit ProposalExecuted(proposalId);
}
