Bump numpy from 1.19.4 to 1.21.0

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.4 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@v1.19.4...v1.21.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -21,7 +21,7 @@ jinja2==2.9.6
 MarkupSafe==2.0.1
 multidict==5.1.0
 nose==1.3.7
-numpy==1.19.4
+numpy==1.21.0
 paramiko==2.9.0
 pep8-naming==0.5.0
 psutil==5.2.2