I have no idea how but postgres was upgraded to 13, but the database was still in 12, so it wouldn't boot.
This URL saved the day: https://quaran.to/Upgrade-PostgreSQL-from-12-to-13-with-Homebrew
brew services stop postgresql
brew postgresql-upgrade-database
./analyze_new_cluster.sh
brew services start postgresql
ps ax | grep postgres
./analyze_new_cluster.sh