[Updated] D10539: black: make codebase compatible with black v21.4b2 and v20.8b1

[Alphare (Raphaël Gomès)]

This revision is now accepted and ready to land.
Alphare accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D10539/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D10539

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