build(deps): bump mypy from 0.800 to 0.812 (#2386)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/requirements-linting.txt

@@ -3,7 +3,7 @@ flake8==3.8.4
 flake8-quotes==3.2.0
 hypothesis==5.44.0
 isort==5.7.0
-mypy==0.800
+mypy==0.812
 pycodestyle==2.6.0
 pyflakes==2.2.0
 twine==3.3.0

tests/requirements-testing.txt

@@ -2,7 +2,7 @@ coverage==5.4
 hypothesis==5.44.0
 # pin importlib-metadata as upper versions need typing-extensions to work if on python < 3.8
 importlib-metadata==3.1.0;python_version<"3.8"
-mypy==0.800
+mypy==0.812
 pytest==6.2.2
 pytest-cov==2.11.1
 pytest-mock==3.5.1