Bump numpy from 1.21.0 to 1.22.0 in /docs (#141)

Bumps [numpy](https://github.com/numpy/numpy) from 1.21.0 to 1.22.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/RELEASE_WALKTHROUGH.rst)
- [Commits](numpy/numpy@v1.21.0...v1.22.0)

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

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Author: dependabot[bot]

docs/requirements.txt

@@ -19,5 +19,5 @@ transformers==2.10.0
 contextlib2==0.6.0.post1
 pandas==1.0.1
 tqdm==4.42.1
-numpy==1.21.0
+numpy==1.22.0
 sphinx-rtd-theme==0.5.0