Update importlib-resources to 5.3.0

[pyup-bot]

This PR updates importlib-resources from 5.2.2 to 5.3.0.

Changelog

5.3.0

======

* 80: Now raise a ``DeprecationWarning`` for all legacy
functions. Instead, users should rely on the ``files()``
API introduced in importlib_resources 1.3. See
`Migrating from Legacy <https://importlib-resources.readthedocs.io/en/latest/using.html#migrating-from-legacy>`_
for guidance on avoiding the deprecated functions.

5.2.3

======

* Updated readme to reflect current behavior and show
which versions correspond to which behavior in CPython.

Links

• PyPI: https://pypi.org/project/importlib-resources
• Changelog: https://pyup.io/changelogs/importlib-resources/
• Repo: https://github.com/python/importlib_resources