sidedata: use revlogv2 requirement in the test helper
We are about to drop the requirement dedicated to sidedata (since revlogv2 will
support them unconditionally and previous version will not.).
To prepare this more we adapt the test code to not use that requirements.
Differential Revision: https://phab.mercurial-scm.org/D10615
[build-system]
requires = ["setuptools", "wheel"]
build-backend = "setuptools.build_meta"
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true