Bump mypy from 0.800 to 0.812

Bumps [mypy](https://github.com/python/mypy) from 0.800 to 0.812.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.800...v0.812)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

poetry.lock

@@ -31,7 +31,7 @@ pylint = "^2.6.0"
 sphinx = "^3.5.3"
 sphinx-autoapi = "^1.7.0"
 sphinx-rtd-theme = "^0.5.1"
-mypy = "^0.800"
+mypy = "^0.812"
 
 [tool.black]
 exclude = '(\.eggs|\.git|\.venv|node_modules/)'