v1.12.1

Release 1.12.1. See CHANGELOG.md for the per-version notes:
https://github.com/z4jdev/z4j/blob/main/CHANGELOG.md

Install: pip install z4j==1.12.1
Docker: docker pull z4jdev/z4j:1.12.1 (multi-arch: linux/amd64, linux/arm64)