Bump numpy from 1.19.4 to 1.19.5 (#44)

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.4 to 1.19.5.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/master/doc/HOWTO_RELEASE.rst.txt)
- [Commits](numpy/numpy@v1.19.4...v1.19.5)

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