fix-ci: backed out changeset 308e45f7b455 The chg variant of the CI see a failure on `tests/test-narrow-pull.t`. Bisecting point the failure as starting at this small changeset… Backing it out, restore the CI on default. It was never broken on stable, which is even more puzzling.

[build-system]
requires = ["setuptools", "wheel"]

[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true