Bump numpy from 1.18.2 to 1.22.0 in /notebook

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.2 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@v1.18.2...v1.22.0)

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

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

Author: dependabot[bot]

notebook/requirements.txt

@@ -34,7 +34,7 @@ nbconvert==5.6.1
 nbformat==5.0.4
 nltk==3.5
 notebook==6.1.5
-numpy==1.18.2
+numpy==1.22.0
 packaging==20.4
 pandas==1.0.3
 pandocfilters==1.4.2