hg-core: upgrade `clap` dependency
Upgrading is a finally possible now that we're supporting a more recent
version of Rust.
This required changes in the `nodemap` example.
[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