Setuptools

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Features
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- Implemented ``Dynamic`` field for core metadata (as introduced in PEP 643).
The existing implementation is currently experimental and the exact approach
may change in future releases. (4698)

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Features
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- Synced with pypa/distutilsc97a3db2f including better support for free threaded Python on Windows (pypa/distutils310), improved typing support, and linter accommodations. (4478)
- Synced with pypa/distutilsff11eed0c including bugfix for duplicate CFLAGS and adaption to support Python 3.13 is_abs in the C compiler (4669). (4790)

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Features
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- Preserve original ``PKG-INFO`` into ``METADATA`` when creating wheel
(instead of calling ``wheel.metadata.pkginfo_to_metadata``).
This helps to be more compliant with the flow specified in PEP 517. (4701)
- Changed the ``WindowsSdkVersion``, ``FrameworkVersion32`` and ``FrameworkVersion64`` properties of ``setuptools.msvc.PlatformInfo`` to return an empty `tuple` instead of `None` as a fallthrough case -- by :user:`Avasam` (4754)

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Features
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- Removed support for ``SETUPTOOLS_DANGEROUSLY_SKIP_PYPROJECT_VALIDATION``, as it
is deemed prone to errors. (4746)

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Features
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- Added support for the environment variable
``SETUPTOOLS_DANGEROUSLY_SKIP_PYPROJECT_VALIDATION=true``, allowing users to bypass
the validation of ``pyproject.toml``.
This option should be used only as a last resort when resolving dependency
issues, as it may lead to improper functioning.
Users who enable this setting are responsible for ensuring that ``pyproject.toml``
complies with setuptools requirements. (4611)

.. attention::
This environment variable was removed in a later version of ``setuptools``.

- Require Python 3.9 or later. (4718)
- Remove dependency on ``importlib_resources``
and the vendored copy of the library.
Instead, ``setuptools`` consistently rely on stdlib's ``importlib.resources``
(available on Python 3.9+). (4718)
- Setuptools' ``bdist_wheel`` implementation no longer produces wheels with
the ``m`` SOABI flag (pymalloc-related).
This flag was removed on Python 3.8+ (see :obj:`sys.abiflags`). (4718)
- Updated vendored packaging version to 24.2. (4740)


Bugfixes
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- Merge with pypa/distutils251797602, including fix for dirutil.mkpath handling in pypa/distutils304.

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Features
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- Allowed using `dict` as an ordered type in ``setuptools.dist.check_requirements`` -- by :user:`Avasam` (4575)


Bugfixes
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- Ensured methods in ``setuptools.modified`` preferably raise a consistent
``distutils.errors.DistutilsError`` type
(except in the deprecated use case of ``SETUPTOOLS_USE_DISTUTILS=stdlib``)
-- by :user:`Avasam` (4567)
- Fix the ABI tag when building a wheel using the debug build of Python 3.13 on Windows. Previously, the ABI tag was missing the ``"d"`` flag. (4674)
- Fix clashes for ``optional-dependencies`` in ``pyproject.toml`` and
``extra_requires`` in ``setup.cfg/setup.py``.
As per PEP 621, ``optional-dependencies`` have to be honoured and dynamic
behaviour is not allowed. (4696)


Misc
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- 4560