Bump numpy from 1.16.3 to 1.21.0 (#50)

Bumps [numpy](https://github.com/numpy/numpy) from 1.16.3 to 1.21.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](numpy/numpy@v1.16.3...v1.21.0)

---
updated-dependencies:
- dependency-name: numpy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 h5py==2.9.0
 nose==1.3.7
-numpy==1.16.3
+numpy==1.21.0
 PyXB==1.2.6
 six==1.12.0
 xsdata==22.2