New package: py-griffe and new build backend: py-pdm-pep517 (#32335)

* New package: py-griffe and new build backend: py-pdm-pep517

* add pdm to build backend docs

lib/spack/docs/build_systems/pythonpackage.rst

@@ -50,8 +50,9 @@ important to understand.
    include `setuptools <https://setuptools.pypa.io/>`__,
    `flit <https://flit.pypa.io/>`_,
    `poetry <https://python-poetry.org/>`_,
-   `hatchling <https://hatch.pypa.io/latest/>`_, and
-   `meson <https://meson-python.readthedocs.io/>`_.
+   `hatchling <https://hatch.pypa.io/latest/>`_,
+   `meson <https://meson-python.readthedocs.io/>`_, and
+   `pdm <https://pdm.fming.dev/latest/>`_.
 
 ^^^^^^^^^^^
 Downloading
@@ -368,6 +369,16 @@ it uses the meson build system. Meson uses the default
 See https://meson-python.readthedocs.io/en/latest/usage/start.html
 for more information.
 
+"""
+pdm
+"""
+
+If the ``pyproject.toml`` lists ``pdm.pep517.api`` as the ``build-backend``,
+it uses the PDM build system. PDM uses the default ``pyproject.toml``
+keys to list dependencies.
+
+See https://pdm.fming.dev/latest/ for more information.
+
 """"""
 wheels
 """"""
@@ -758,3 +769,4 @@ For more information on build backend tools, see:
 * poetry: https://python-poetry.org/
 * hatchling: https://hatch.pypa.io/latest/
 * meson: https://meson-python.readthedocs.io/
+* pdm: https://pdm.fming.dev/latest/