rust: Upgrade to format-bytes 0.3
This removes use of the proc-macro-hack crate, which is possible now that
we don’t support Rust 1.41 to 1.44 anymore.
This in turn fixes spurious errors reported by rust-analyser:
https://github.com/rust-analyzer/rust-analyzer/issues/9606#issuecomment-919240134
Differential Revision: https://phab.mercurial-scm.org/D11938
[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