py-jsonpickle: updated to 3.0.4

v3.0.4

* Fixed an issue with django.SafeString and other classes inheriting from
  str having read-only attribute errors
* The test suite was made compatible with `pytest-ruff>=0.3.0`.
* A `garden.yaml` file was added for use with the
  `garden <https://crates.io/crates/garden-tools>_` command runner.
* The test suite was updated to avoid deprecated SQLALchemy APIs.
* The `jaraco.packaging.sphinx` documentation dependency was removed.

(adam)