Applied changes from `importlib_metadata 8.7

<https://importlib-metadata.readthedocs.io/en/latest/history.html#v8-7-0>`_,

including ``dist`` now disallowed for:meth:`importlib.metadata.EntryPoints.select`; deferred

imports for faster import times; added support for metadata with newlines

(python/cpython#119650); and ``metadata()`` function now returns ``None``

when a metadata directory is present but no metadata is present.