Bump numpy from 1.18.1 to 1.22.0

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.1 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@v1.18.1...v1.22.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 pandas == 0.25.3
-numpy == 1.18.1
+numpy == 1.22.0
 arrayfire == 3.6.20181017
 enum34 == 1.1.6