Sphinx-substitution-extensions

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- Support Python 3.13.
- In MyST documents, support the ``myst_sub_delimiters`` option.
This means you can use the ``{{replace-me}}`` syntax in MyST documents.

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- Bump the minimum supported version of Sphinx to 7.3.5.
- Remove support for ``sphinx-prompt``.
Please create a GitHub issue if you have a use case for this extension which is not covered by the built-in Sphinx functionality.

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- Add ``substitution-download`` role.

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- Add support for MyST.
Thanks to Václav Votípka (eNcacz) for the contribution.

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- Bump the minimum supported version of Sphinx to 7.2.0.
- Bump the minimum supported version of docutils to 0.19.
- ``sphinx-prompt`` is no longer an optional dependency, meaning you can remove the ``[prompt]`` extras dependency specification.
- Remove the need to specify the ``sphinx-prompt`` extension in ``conf.py`` in order to use the ``prompt`` directive.
- Support Python 3.12
- Drop support for Python 3.9

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- Breaking change: The required Sphinx version is at least 4.0.
- ``sphinx-prompt`` is now an optional dependency.
Thanks go to dgarcia360 for this change.