Add mypy pre-commit hook

[silky]

Description

There's a lot of mypy type annotations, but mypy wasn't in the list of pre-commit hooks.

This adds it back! Happily, no actual type-fixes were required; everything was already correct! :)

Checklist

• [x] Dependencies install correctly in a clean environment and code executes;
• [ ] Test coverage extended; created tests fail without the change (if possible);
• [x] All tests passing;
• [x] Commits follow a type convention (e.g. https://gist.github.com/brianclements/841ea7bffdb01346392c#type);
• [ ] Extended the README, documentation and/or docstrings, if necessary;

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