Update mypy requirement from 0.930 to 0.971
Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](https://github.com/python/mypy/compare/v0.930...v0.971)
---
updated-dependencies:
- dependency-name: mypy
dependency-type: direct:development
...
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[tool.poetry.dev-dependencies]
pytest = "^7.0.1"
-mypy = "0.930"
+mypy = "0.971"
flake8 = "^5.0.4"
black = {version = "^21.5-beta.1", python = "^3.7"}
mkdocs = "^1.2.1"