⬆ Update mypy requirement from ^0.991 to ^1.4 (#269)

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v0.991...v1.4.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
...

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pyproject.toml

@@ -14,7 +14,7 @@ pytest = "^7.0.1"
 black = "^22.10"
 isort = "^5.8.0"
 autoflake = "^2.0.0"
-mypy = "^0.991"
+mypy = "^1.4"
 
 [build-system]
 requires = ["poetry>=0.12"]