pycompat: filter more of the traceback in `test-flagproccessor.t`
The traceback changes again with 3.13. So we filter it to only keeps the bits we
care about. This is actually only reusing the approach from a few line below.
[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