Raiden-contracts

- Reduce dependencies and dependency updates
- Drop python3.7 support

- [1580](https://github.com/raiden-network/raiden-contracts/issues/1580) Establish better naming convention for time related values
- [1550](https://github.com/raiden-network/raiden-contracts/issues/1550) Replace settle timeout range with one constant value
- [1582](https://github.com/raiden-network/raiden-contracts/issues/1582) Move settle timeouts from channels to token networks
- [1565](https://github.com/raiden-network/raiden-contracts/issues/1565) Switch from block numbers to dates/time values
- [1612](https://github.com/raiden-network/raiden-contracts/issues/1612) Add deployment option for user deposit withdraw timeout
- [1608](https://github.com/raiden-network/raiden-contracts/issues/1608) Extend documentation for Arbitrum gas prices
- [1623](https://github.com/raiden-network/raiden-contracts/pull/1623) Add API endpoint to verify Arbitrum One deployments

- [1602](https://github.com/raiden-network/raiden-contracts/pull/1602) Upgrade and unpin `web3` dependency

- [1584](https://github.com/raiden-network/raiden-contracts/pull/1584) Upgrade `web3` and `eth-tester` dependencies

- [1576](https://github.com/raiden-network/raiden-contracts/pull/1576) Add missing `mypy_extensions` requirement

- [1517](https://github.com/raiden-network/raiden-contracts/pull/1517), [#1522](https://github.com/raiden-network/raiden-contracts/pull/1522) Upgrade to solidity 0.8 series
- [1519](https://github.com/raiden-network/raiden-contracts/pull/1519) Use `block.chainid` in contracts instead of a deploy time value
- This changes the ABI of the `TokenNetworkRegistry` and `TokenNetwork` contract constructors