Bump black from 20.8b1 to 21.5b1 in /src/requirements

Bumps [black](https://github.com/psf/black) from 20.8b1 to 21.5b1.
- [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)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2021-05-11 05:20:49 +00:00 committed by GitHub
parent 7bd5db2ac7
commit 57ab1cf9b3
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@ -4,7 +4,7 @@ django-debug-toolbar==2.2.1
factory_boy==3.1.0
coverage==5.3
codecov==2.1.10
black==20.8b1
black==21.5b1
pre-commit==2.12.1
isort==5.6.4
hypothesis==6.10.1