build(deps): bump numpy from 1.18.5 to 1.22.0 in /backend

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.5 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@v1.18.5...v1.22.0)

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

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

Author: dependabot[bot]

backend/requirements.txt

@@ -51,7 +51,7 @@ mypy==0.910
 mypy-extensions==0.4.3
 networkx==2.6.3
 nodeenv==1.6.0
-numpy==1.18.5
+numpy==1.22.0
 opencv-python==4.5.3.56
 opt-einsum==3.3.0
 outcome==1.1.0