Sphinxcontrib-bibtex

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* Increase required pybtex-docutils version to 1.0.2
(reported by ego-thales).

* Fix test suite for docutils 0.22
(fixed by mitya57, see pull request 377).

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* Require pybtex 0.25 and remove setuptools dependency hack
(fixed by flying-sheep, see pull request 372).

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* Add Python 3.13 support.

* Add setuptools as dependency on all Python versions.
This fixes an issue with an undeclared setuptools dependency
in the latest release of pybtex.
See discussion in issue 345.

* Python 3.7 and 3.8 are EOL and are therefore no longer officially supported.

* FootCiteRole now derives from SphinxRole instead of XRefRole,
simplifying the implementation.

* Bib files in conf.py are now resolved relative to confdir instead of srcdir
(reported and fixed by rgambord, see issue 357 and pull request 358).

* Duplicate label warnings are no longer issued if the non-prefixed keys
are identical. This allows having duplicate citations,
as long as the keys are differently prefixed, which is a common use case.
See issue 365 reported by ego-thales.

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* Add setuptools as a runtime dependency on Python 3.12. This works around
an issue with the latest release of pybtex not working on Python 3.12
otherwise. See issue 345.

* Migrate setup.py to pyproject.toml. This fixes a ``namespace_packages``
warning on setuptools. See issue 350.

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* Fix bibliography header repetition when recompiling documents
(reported by ragonneau, see issue 342 and pull request 343).

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* The ``:cite:alp:`` role in the super style now also suppresses the sup tag
in addition to the brackets, to make it easier to apply the necessary formatting
around the citation.