Nomic Testnet v8.1

What's Changed

This version comes with new features such as:

• A system for communicating with EVM-based blockchains (starting with the Ethereum Sepolia testnet), allowing nBTC to be used as an ERC-20 token (https://blog.nomic.io/nbtc-ethereum-upgrade-c297ded38514)
• The implementation of the Osmosis revenue sharing agreement, as approved by governance of both protocols (https://forum.osmosis.zone/t/nbtc-revenue-share-proposal/2791)
• Enhancements to the Bitcoin relayer, and onchain Bitcoin fee handling
• Other improvements and fixes