bundlespec: phase out the `_bundlespeccgversions` mapping
The `_bundlespeccgversions` mapping is redundant with the `cg.version`
parameter. We move all users to the `cg.version` version and phase out the
`_bundlespeccgversions` mapping.
[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