Downloads for spicy-1.2.1 are available:
https://github.com/zeek/spicy/releases/tag/v1.2.1
https://hub.docker.com/layers/zeekurity/spicy/1.2.1/images/sha256-b8ef16d249fe864310e8bfc75421ccfefd585c0a6e022e012802b32325dec7b0
https://github.com/zeek/homebrew-zeek/blob/05c09e5f766969f5c8370087d308f95ff4607448/README.md
See the CHANGES file for a detailed list of the changes, https://github.com/zeek/spicy/blob/release/1.2/CHANGES.