Bump black from 21.4b2 to 21.5b2

Bumps [black](https://github.com/psf/black) from 21.4b2 to 21.5b2.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

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

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

Author: dependabot[bot]

requirements-test.txt

@@ -1,6 +1,6 @@
 mypy==0.812
 flake8==3.8.*
-black==21.4b2
+black==21.5b2
 
 codespell==1.17.1
 
@@ -10,4 +10,4 @@ coverage==5.2.*
 doc8==0.8.1
 
 # optional dependencies
-orjson==3.5.2
+orjson==3.5.3