build(deps): Bump jsonpickle from 3.0.2 to 3.0.3

[dependabot]

Bumps jsonpickle from 3.0.2 to 3.0.3.

Changelog

Sourced from jsonpickle's changelog.

v3.0.3

* Compatibilty with Pandas and Cython 3.0 was added. ([#460](https://github.com/jsonpickle/jsonpickle/issues/460)) (+477)
* Fixed a bug where pickling some built-in classes (e.g. zoneinfo) 
  could return a ``None`` module. ([#447](https://github.com/jsonpickle/jsonpickle/issues/447))
* Fixed a bug where unpickling a missing class would return a different object
  instead of ``None``. (+471)
* Fixed the handling of missing classes when setting ``on_missing`` to ``warn`` or ``error``. (+471)
* 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.

Commits

• 5fbd4fe Merge pull request #476 from davvid/debian
• 3161d56 docs: make extensions disabled by Debian optional
• 637edf6 docs: fix sphinx warnings
• bc805cc Apply black to code
• de10ebd Merge pull request #477 from davvid/cython-functions
• cfcc106 CHANGES: Pandas and Cython 3.0 compatibility
• 65b078b pickler/unpickler: pickle functions and Cython functions earlier
• fb4ff99 pickler/unpickler: record ref entries for functions
• 78b7ce7 pickler: flatten Cython functions using _flatten_function()
• 27b9edf Merge pull request #475 from davvid/ruff
• Additional commits viewable in compare view

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[github-actions]

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[dependabot]

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