py-jsonpickle: updated to 3.0.3

v3.0.3

* Compatibilty with Pandas and Cython 3.0 was added.
* Fixed a bug where pickling some built-in classes (e.g. zoneinfo)
  could return a ``None`` module.
* Fixed a bug where unpickling a missing class would return a different object
  instead of ``None``.
* Fixed the handling of missing classes when setting ``on_missing`` to ``warn`` or ``error``.
* The test suite was made compatible with Python 3.12.
* The tox configuration was updated to generate code coverage reports.
* The suite now uses ``ruff`` to validate python code.
* The documentation can now be built offline when ``rst.linker`` and
  ``jaraco.packaging.sphinx`` are not available.

(adam)