Bump mypy from 0.781 to 0.782

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] <support@dependabot.com>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -15,7 +15,7 @@ flake8-quotes==3.2.0  # Require single quotes
 flake8==3.8.3  # Lint
 freezegun==0.3.15
 isort==4.3.21  # Lint imports
-mypy==0.781  # Type checking
+mypy==0.782  # Type checking
 pip_check_reqs==2.1.1
 pydocstyle==5.0.2  # Lint docstrings
 pyenchant==3.1.1  # Bindings for a spellchecking sytem