Jaraco.packaging

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Features
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- Deprecated use of environment variable for isolated builds. The workaround is in the wrong place and should be dealt with upstream. (11)

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Features
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- Add sidebar-links directive.
- Require Python 3.8 or later.

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7, 10, 11: Added environment variable to bypass
building metadata for offline builds.

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6: Added minimal test to ``sphinx.packaging``.

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Change requirement to ``build[virtualenv]`` as workaround for
`pypa/build266 <https://github.com/pypa/build/issues/266>`_.

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Prefer ``build`` to ``pep517`` for loading package metadata.