Bump numpy from 1.20.3 to 1.21.2

Bumps [numpy](https://github.com/numpy/numpy) from 1.20.3 to 1.21.2.
- [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/v1.20.3...v1.21.2)

dios/requirements.txt

-numpy==1.20.3
+numpy==1.21.2
 pandas==1.2.4
 python-dateutil==2.8.1
 pytz==2021.1

requirements.txt

@@ -4,7 +4,7 @@ hypothesis==6.13.10
 matplotlib==3.4.2
 mlxtend==0.18.0
 numba==0.53.1
-numpy==1.20.3
+numpy==1.21.2
 outlier-utils==0.0.3
 pyarrow==4.0.1
 pandas==1.2.4