Add blurb

Author: jaraco

Misc/NEWS.d/next/Library/2023-04-16-19-48-21.gh-issue-103584.3mBTuM.rst

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+Updated ``importlib.metadata`` with changes from ``importlib_metadata`` 5.2
+through 6.4.1, including: Support ``installed-files.txt`` for
+``Distribution.files`` when present. ``PackageMetadata`` now stipulates an
+additional ``get`` method allowing for easy querying of metadata keys that
+may not be present. ``packages_distributions`` now honors packages and
+modules with Python modules that not ``.py`` sources (e.g. ``.pyc``,
+``.so``). Expand protocol for ``PackageMetadata.get_all`` to match the
+upstream implementation of ``email.message.Message.get_all`` in
+python/typeshed#9620. Declared ``Distribution`` as an abstract class,
+enforcing definition of abstract methods in instantiated subclasses.
+Deprecated expectation that ``PackageMetadata.__getitem__`` will return
+``None`` for missing keys. In the future, it will raise a ``KeyError``.