The numpy people marked aliases of builtin types like np.int as deprecated in version 1.20.0. They are effectively deprecated with version 1.24.0 which was just released.
This leads to a bunch of AttributeErrors, like
AttributeError: module 'numpy' has no attribute 'int'
Your requirements.txt states compatability for numpy >=1.7 and thus causes CI to crash on this (but that's on the numpy folks).
The corresponding pull request is #105 .
This issue is related to cobra issue 1305