Raiden-services

* Add cache to `to_address_checksum` function

* Fix service URL registration when `ping` is not installed (https://github.com/raiden-network/raiden-services/issues/1065)

* Update to contracts 0.40.0rc (https://github.com/raiden-network/raiden-services/pull/1062)
* Update to raiden dependency to [latest develop](https://github.com/raiden-network/raiden/commit/9e4ac56117314bc4630e8bf68da2424c01989025) (https://github.com/raiden-network/raiden-services/pull/1062)

* Update to contracts 0.39.0 (https://github.com/raiden-network/raiden-services/pull/1052)
* Handle channels closed by cooperative settlement (https://github.com/raiden-network/raiden-services/issues/1040)
* Simplify MS code by using new contract interface (https://github.com/raiden-network/raiden-services/issues/807)
* Fix PFS handling of certain environment variables (https://github.com/raiden-network/raiden-services/issues/1023)

* Add displayname to address metadata (https://github.com/raiden-network/raiden-services/pull/1009)
* Add end endpoint to retrieve all online addresses (https://github.com/raiden-network/raiden-services/pull/1010)
* Fix a crash of the `service_registry` script on private chains
* Add Python 3.9 support (https://github.com/raiden-network/raiden-services/pull/877)

* Fix a crash of the `service_registry` script on private chains