[Updated] D9834: black: merge config into main pyproject.toml now that we have it

[marmoute (Pierre-Yves David)]

marmoute added a reverting change: rHG5be886200eb6: ci-fix: backed out changeset d4c8b4b90ecb.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D9834/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D9834

To: durin42, #hg-reviewers, Alphare, mharbison72
Cc: Alphare, mercurial-patches
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