def get_intersphinx_version(pyproj, dep):
    deps = pyproj["project"]["dependencies"]
    for d in deps:
        req = Requirement(d)
        if req.name not in dep:
            continue
        if req.specifier:
            return next(iter(req.specifier)).version
        else:
            return "latest"

with open("../pyproject.toml", "rb") as fp:
    pyproj = tomllib.load(fp)
    am_ver = get_intersphinx_version(pyproj, "amaranth")