Bump numpy from 1.19.5 to 1.22.0 in /python (#1080)

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.5 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@v1.19.5...v1.22.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

python/requirements.txt

@@ -1,3 +1,3 @@
 flatbuffers==2.0
-numpy==1.19.5
+numpy==1.22.0
 tflite==2.4.0