Bump numpy from 1.15.0 to 1.22.0

Bumps [numpy](https://github.com/numpy/numpy) from 1.15.0 to 1.22.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst)
- [Commits](numpy/numpy@v1.15.0...v1.22.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,6 +1,6 @@
 imageio==2.13.3
 matplotlib==2.2.2
-numpy==1.19.5
+numpy==1.22.0
 pandas==0.23.4
 python-dateutil==2.7.3
 pytz==2018.5