InfinityStaker.sol is not supposed to receive ETH. Instead of using a rescue function, remove receive() and fallback() altogether.
Instances include:
fallback() external payable
receive() external payable
function rescueETH(address destination) external payable
Remove these functions, or include a call to rescueETH in receive(), so that a user that mistakenly sends ETH to the Staker retrieves it immediately.
