Bump mypy from 0.781 to 0.782 (#438)

Bumps [mypy](https://github.com/python/mypy) from 0.781 to 0.782.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.781...v0.782)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

poetry.lock

@@ -56,7 +56,7 @@ typing-extensions = "^3.7"
 
 
 [tool.poetry.dev-dependencies]
-mypy = "^0.781"
+mypy = "^0.782"
 wemake-python-styleguide = "^0.14"
 flake8-pytest-style = "^1.2"
 flake8-pyi = "^20.5"