The latest alpha release for mev-boost is v1.7-alpha1 which is the recommended version for the upcoming Goerli upgrade happening on 2024-01-17 ~UTC 6:30am.
Please upgrade mev-boost to the alpha release if running validators on Goerli.
For more information around the release and fork please see Upcoming MEV-Boost Release: v1.7 (Deneb) · Issue #605 · flashbots/mev-boost · GitHub