Cython and lumpy version in pyproject.toml incompatible with python v>3.10

[build-system]

requires = ["setuptools",
            "setuptools_scm",
            "wheel",
            "extension-helpers",
            "numpy<2.0",                 <-- because `pysynphot` still calls the alias `np.alltrue` 
            "cython>=0.29.36"].     <-- this version works, but I don't believe this "dependency" is even used in the code

build-backend = 'setuptools.build_meta'