chore(deps-dev): bump mypy from 0.812 to 0.902 (#68)

Bumps [mypy](https://github.com/python/mypy) from 0.812 to 0.902.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.812...v0.902)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Pipfile

@@ -16,7 +16,7 @@ aerich = "*"
 black = "==21.4b2"
 isort = "==5.8.0"
 flake8 = "*"
-mypy = "==0.812"
+mypy = "==0.902"
 "discord.py-stubs" = "~=1.7"
 pre-commit = "~=2.10"