Latest contracts release deployed to mainnet. These are only
implementation addresses. The deploy config is updated with
the `systemConfigStartBlock` which should be set to the
block number that the contract was initialized in.
This happened in the following tx: https://etherscan.io/tx/0x76bceccd7d44656f5a129a600a6120091570b897c1d45c18cd7134cfe67c2537
which was included in block 17422444.