Bump numpy from 1.19.5 to 1.20.3 (#342)

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.5 to 1.20.3.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](https://github.com/numpy/numpy/compare/v1.19.5...v1.20.3

)

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