setup.py: Add numpy as required for install_requires (#34510)
Summary:
Was originally not a requirement but we should add it back here since
it's required on import and we require it anyways for our conda
packages.
Tested with:
```
❯ pkginfo -f requires_dist *.whl
requires_dist: ['numpy']
```
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34510
Differential Revision: D20352125
Pulled By: seemethere
fbshipit-source-id: 383e396fe500ed7043d83c3df57d1772d0fff1e6
