ci-fix: backed out changeset d4c8b4b90ecb This changeset is part of a series that break Continuous integration on python 2 for about a week. As not concrete solution have been found so far the safer seems to back it out until we can figure the details out. Differential Revision: https://phab.mercurial-scm.org/D9947

#require black test-repo

  $ cd $RUNTESTDIR/..
  $ black --config=black.toml --check --diff `hg files 'set:(**.py + grep("^#!.*python")) - mercurial/thirdparty/**'`