multicast in source builds from vulnerable setuptools dependency

Impact Some source-builds may be impacted by a CWE-1395 eg. vulnerable setuptools dependency. Multicast prior to v2.0.9a3 on systems with minimal dependancies installed may use setuptools =80.4 Pre-release version v2.0.9a3 and later are recommended for improved stability over v2.0.9a0 Workarounds...