Fixtures

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* Add missing license and metadata files to sdist.

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* Remove accidentally included `venv` folder.

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* Remove dependency of pbr and start using pyproject.toml for setuptools

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* Republish using Trusted Publishing (properly this time).
(Colin Watson)

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* Republish using Trusted Publishing.
(Colin Watson)

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* Use ``code-block`` directive for Python code.
(Pavel Kulyov)

* Add support for Python 3.12 and 3.13.
(James Page, Colin Watson)

* Drop support for Python 3.7 (EOL)
(Jelmer Vernooij)

* Drop support for external ``mock`` package.
(Colin Watson, https://github.com/testing-cabal/fixtures/issues/88)