Alderaan - Wolpertinger

Features

• Update WebUI to version 1.0.2: https://github.com/raiden-network/webui/releases/tag/v1.0.2
• Add /contracts endpoint with information about the used contracts. (#5407)
• Adds minimum required balance to send out MonitorRequest on mainnet.

Bug fixes

• Don't crash at /payments when no target address is given. (#6217)
• Handling no ETH exception in the minting endpoint. (#6323)