Black released a new version (23.1.0) yesterday (1 Feb 23) that changed some formatting rules and is now breaking the tests. (Fixing black to v22.12.0 will pass.) The formatting changes touch a pretty decent number of files (173), and it looks like most of those changes are around empty line formatting.
Seems like something we might want to address quickly so that merging of upcoming phase 8 work is not complicated by these formatting differences.