Release v3.3.0 of mempool/electrs for use with mempool/mempool v3.3

Highlights

1. Fixed a rare bug that occurred if the process exited in the middle of processing a re-org.
2. Added the blockchain.scripthash.unsubscribe method to the Electrum RPC.

What's Changed

• Fix rollback tip handling by @junderw in #118
• Feat: Add blockchain.scripthash.unsubscribe to Electrum server impl by @junderw in #122
• Add FreeBSD CI job, update to 1.87 (FreeBSD 14.3) and fix clippy lints by @junderw in #125
• Feat: Add X-Bitcoin-Version header to all responses from REST API. by @junderw in #124
• Bump rocksdb dependency by @junderw in #123
• Set review needed automatically by @orangesurf in #127
• Update CI workflow to install rocksdb and run full build by @junderw in #126

New Contributors

• @orangesurf made their first contribution in #127

Full Changelog: v3.2.0...v3.3.0