root/pypi: links for ortools-stubs

root/pypi ortools-stubs-8.0.0.tar.gz
root/pypi ortools-stubs-7.8.0.tar.gz
root/pypi ortools-stubs-7.7.0.tar.gz
root/pypi ortools-stubs-7.6.0.tar.gz
root/pypi ortools-stubs-7.5.1.tar.gz
root/pypi ortools-stubs-7.5.tar.gz