Using `pyproject.toml` to configure Julia dependencies

x-posting for visibility: https://github.com/JuliaPy/pyjuliapkg/issues/16

Start with the linked JuliaPy/pyjuliapkg#16 issue, which is the only referenced source of requirements. Confirm the intended pyproject.toml-based dependency configuration and define acceptance criteria before locating implementation or tests; this issue provides no file, entry point, or completion check.

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