Bump numpy from 1.15.1 to 1.22.0

Bumps [numpy](https://github.com/numpy/numpy) from 1.15.1 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@v1.15.1...v1.22.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -27,7 +27,7 @@ mistune==0.8.3
 nbconvert==5.3.1
 nbformat==4.4.0
 notebook==5.6.0
-numpy==1.15.1
+numpy==1.22.0
 pandas==0.23.4
 pandocfilters==1.4.2
 parso==0.3.1