Warning: Explicit parallel read safety declaration

[dgarcia360]

The following warning appears when building documentation using the sphinx_lua extension and Sphinx 8.x in parallel mode:

WARNING: the sphinx_lua extension does not declare if it is safe for parallel reading, assuming it isn't - please ask the extension author to check and make it explicit

This would help improve build performance and eliminate the warning.

To resolve this, normally this is defined in the setup.py as follows:

def setup(app):
    (...)
    return {
        "version": "1.0",  # Replace with your extension's version
        "parallel_read_safe": True,  # Declare if safe for parallel reading
        "parallel_write_safe": True,  # Declare if safe for parallel writing
    }